GHG emissions calculation device and GHG emissions calculation method

Abstract

To provide a GHG emissions calculation device capable of calculating product-specific GHG emissions under various conditions and simply evaluating the GHG reduction efforts of a company, and a method thereof.SOLUTION: A GHG emissions calculation device for calculating the GHG emissions of a product is configured to: calculate first GHG emissions, which are the average value of GHG emissions of the product by multiplying the average value of GHG emission factor of the product by the activity level of the product; calculate a correction coefficient by dividing the company-level GHG emissions related to the product by the total sum of the first GHG emissions calculated for each product; and calculate second GHG emissions for each product by multiplying each of the first GHG emissions for each product by the correction coefficient.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a GHG emission calculation device that calculates the carbon dioxide emissions per product unit using the carbon dioxide emissions of an enterprise unit.

Background Art

[0002] The global effort towards carbon neutrality to achieve a balance between greenhouse gas (hereinafter referred to as GHG: Greenhouse Gas) emissions and the removal amount by absorption sources is actively underway. In order to work towards reducing GHG emissions towards decarbonization, a mechanism for calculating GHG emissions is important.

[0003] The calculation targets of GHG emissions can be roughly divided into two categories: the calculation of GHG emissions at the enterprise unit level, which represents the GHG emissions related to all products incorporated by an enterprise, and the calculation of GHG emissions by product (product unit), which represents the emissions per product unit incorporated by an enterprise.

[0004] The GHG emissions at the enterprise unit level enable the visualization of the GHG reduction efforts of an organization or enterprise as a whole, but have the property of being difficult to narrow down the targets for implementing GHG reduction measures.

[0005] On the other hand, by calculating the GHG emissions by product, it becomes possible to identify products with high GHG emissions, making it easier for enterprises to implement measures such as reducing GHG emissions through the application of green materials.

[0006] A general method for calculating GHG emissions by product is to multiply the activity amount by the GHG emission unit price of each component and member that make up the product. However, depending on the product, the number of components and members becomes extremely large, and the association with the GHG emission unit price during calculation becomes complicated, so the number of enterprises that can calculate GHG emissions by product is limited.

[0007] Conventionally, as an invention for calculating GHG emissions, the CO2 emissions calculation device described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2015-56111) includes an emission coefficient database 31 that stores a CO2 emission coefficient for each first member, and an emission coefficient database 32 that stores a unit quantity and a CO2 emission coefficient for each second member. The first member CO2 amount calculation unit 34 calculates the CO2 emission amount of each first member constituting the designed building based on the quantity of the first member and the CO2 emission coefficient corresponding to the first member stored in the emission coefficient database 31. The second member CO2 amount calculation unit 38 calculates the CO2 emission amount of each second member constituting the designed building based on the number of building units constituting the designed building, the unit quantity corresponding to the second member stored in the emission coefficient database 32, and the CO2 emission coefficient.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] In the method of Patent Document 1, the first member that directly calculates the GHG emissions by multiplying the unit consumption by the emissions and the second member that is estimated as a unit part are selected, and the GHG emissions are totaled to enable relatively simple calculation of the GHG emissions by product while omitting the labor of calculation.

[0010] However, there is no change in the method of stacking and totaling the members and materials constituting the product, and in addition to the time-consuming aspect, there is no mention of a method for simply evaluating the company's GHG reduction efforts.

[0011] Therefore, the present invention provides a GHG emission calculation device and a method thereof that can calculate the GHG emissions by product under various conditions and easily evaluate the GHG reduction efforts of enterprises.

Means for Solving the Problems

[0012] In order to solve the above problems, the present invention is a GHG emission calculation device for calculating the GHG emissions of products, which multiplies the average value of the GHG emission per unit of the product by the activity amount of the product to calculate the first GHG emission, which is the average value of the GHG emissions of the product, and calculates a correction coefficient by dividing the GHG emissions at the enterprise level for the product by the sum of the first GHG emissions calculated for each product, and calculates the second GHG emission for each product by multiplying each of the first GHG emissions for each product by the correction coefficient.

Effects of the Invention

[0013] According to the present invention, it is possible to appropriately calculate and visualize the GHG emissions by product according to the data provision status of the GHG emissions from suppliers, and further, it is possible to easily evaluate the GHG reduction efforts by suppliers.

[0014] Problems, configurations, and effects other than those described above will be clarified by the description of the embodiments for carrying out the following invention.

Brief Description of the Drawings

[0015]

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Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of the GHG emission calculation device of the present invention will be described with reference to the drawings. The embodiments are examples for explaining the present invention, and for the sake of clarity of explanation, appropriate omissions and simplifications have been made. The present invention can also be implemented in various other forms. Unless otherwise particularly limited, each component may be singular or plural.

[0017] In the drawings, the positions, sizes, shapes, ranges, etc. of the respective components shown may not represent the actual positions, sizes, shapes, ranges, etc. for the purpose of facilitating the understanding of the invention. Therefore, the present invention is not necessarily limited to the positions, sizes, shapes, ranges, etc. disclosed in the drawings.

[0018] As examples of various information, it may be described in expressions such as "table" and "list", but the various information may be represented by data structures other than these. For example, various information such as "XX table" and "XX list" may be referred to as "XX information". When explaining identification information, expressions such as "identification information", "identifier", "name", "ID", "number", etc. are used, but these are mutually replaceable.

[0019] When there are a plurality of components having the same or similar functions, they may be described with the same reference numeral and different subscripts. Also, when it is not necessary to distinguish these multiple components, the subscripts may be omitted in the description.

[0020] In the embodiments, the processing performed by executing a program may be described. Here, the computer executes the program by a processor (e.g., CPU, GPU), and performs the processing defined by the program while using storage resources (e.g., memory) and interface devices (e.g., communication ports), etc. Therefore, the subject of the processing performed by executing the program may be the processor. Similarly, the subject of the processing performed by executing the program may be a controller, device, system, computer, or node having a processor. The subject of the processing performed by executing the program may be an arithmetic unit and may include a dedicated circuit for performing a specific processing. Here, the dedicated circuit is, for example, an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), a CPLD (Complex Programmable Logic Device), etc.

[0021] The program may be installed in a computer from a program source. The program source may be, for example, a program distribution server or a computer-readable storage medium. When the program source is a program distribution server, the program distribution server includes a processor and a storage resource for storing the program to be distributed, and the processor of the program distribution server may distribute the program to be distributed to other computers. Also, in the embodiment, two or more programs may be realized as one program, or one program may be realized as two or more programs.

Embodiment

[0022] Using FIGS. 1 to 6, a GHG emission calculation support system according to Embodiment 1 of the present invention will be described.

[0023] <Configuration of GHG Emission Calculation Device> First, using FIG. 1, the components of the GHG emission calculation device 100 of this embodiment will be described.

[0024] The GHG emission calculation device 100 of this embodiment is configured by a computer device, and includes a supplier information management unit 110, an emission calculation unit 120, a product information management unit 130, a calculation result display unit 140, and an input unit 150. Note that the storage devices of the supplier information management unit 110, the product information management unit 130, and the emission calculation unit 120 described later may be realized by dividing the storage area of the same storage device, or may be realized by an external storage device connected by a communication line (not shown).

[0025] The supplier information management unit 110 is configured by a storage device, and is a database including a supplier name and product name database (DB) 111, a product purchase amount DB 112, a product purchase amount DB 112, a product purchase weight DB 113, an enterprise unit GHG emission amount DB 114, a product unit GHG emission amount base unit DB, and a first management code DB 116.

[0026] The Supplier Name and Product Name DB111 is supplier information in the enterprise that calculates the GHG emissions corresponding to Scope 3 of the international standard "GHG Protocol". For example, as shown in Figure 2A, the supplier name of the parts purchaser of the enterprise and the name of the parts are stored.

[0027] The Product Purchase Amount DB112 stores the purchase amount in annual units for the Supplier Name and Product Name DB111, as shown in Figure 2B for example.

[0028] The Product Purchase Weight DB113 stores the purchase weight of the products purchased for the Supplier Name and Product Name 111DB, as shown in Figure 2C for example.

[0029] The product purchase amount and product purchase weight stored in these DBs correspond to the activity levels in calculating GHG emissions, and the enterprise can obtain this data during the purchase transactions with suppliers. Also, for management, if activity levels other than purchase amount and weight, such as "sheets" or "pieces", are required, information can be appropriately added to the Supplier Information Management Department 110.

[0030] The Enterprise Unit GHG Emissions DB114 stores the Scope 3 equivalent GHG emissions at the enterprise unit for each supplier, as shown in Figure 2D for example. The enterprise can receive information from each supplier, but in the case of Figure 2D, the fact that there was no information provided from "□ Company" is indicated by "-".

[0031] The Product Unit GHG Emission Factor DB115 stores the Scope 3 equivalent GHG emission factors at the product (part) unit handled by each supplier, as shown in Figure 2E for example. The enterprise can receive information from each supplier, but in the case of Figure 2E, the fact that there was no information provided from "〇 Company" and "□ Company" is indicated by "-". Also, if it is possible to receive the emissions themselves at the product unit instead of the emission factors from each supplier, the value can be stored.

[0032] As shown in, for example, FIG. 2F, the first management code DB 116 records the name (purchased product name) for managing the products (parts) purchased from the supplier in the enterprise and its management code (purchased product code) in association with each other.

[0033] The product information management unit 130 is configured by a storage device and is a database including a product BOM (Bill of Material)-DB 131, an emission factor storage unit 132, and a management code DB 133.

[0034] The product BOM-DB 131 is, for example, data in which the units or groups of parts constituting the product are linked as shown in FIG. 2G, and the units and parts constituting the product can be extracted.

[0035] The emission factor storage unit 132 is, for example, a database that stores the average factor obtained from a database in which representative (average) values of GHG emission factors of various products in each enterprise, such as an input-output table and IDEA, are published as shown in FIG. 2H. In this example, the name and management code of the factor are also recorded.

[0036] As shown in, for example, FIG. 2I, the second management code DB 133 records the part name on the product BOM-DB 131 and its part code in association with each other.

[0037] In the emission amount calculation unit 120 described later, necessary data is extracted from each of the above DBs to perform various calculations.

[0038] For example, FIG. 3 is an example (table) of data and codes extracted from the first management code DB 116, the emission factor storage unit 132, and the second management code DB 133, where the part code 303 for the part name 304 in the product BOM-DB 131, the purchase part code 301 corresponding to the purchase part name 302 of that part in the enterprise, and further, the unit name 306 of the average emission factor of the corresponding input-output table or IDEA, etc., and its unit code 305 are linked to the GHG emission factor 307.

[0039] Also, FIG. 4 is an example (table) of data extracted including the supplier name 401, the enterprise-level emissions 402 (reported value from the supplier), the part name 403, the purchase amount 404, and the emission factor (average value 405 and reported value 406 from the supplier).

[0040] When calculating the emissions described later, the contents of these tables may be temporarily stored in a predetermined storage area (not shown) in the storage unit of the emission calculation unit 120, and the values required for the calculation may be referred to.

[0041] The emission calculation unit 120 is composed of a storage unit (not shown) and an arithmetic processing unit (CPU) (not shown), and includes a product-by-product GHG emission calculation unit 121 using the average factor, a supplier factor calculation unit 122, a product-by-product GHG emission calculation unit 123 using the supplier factor, a product-by-product GHG emission calculation unit 124 using the supplier-provided factor, and a calculation result storage unit 125.

[0042] Note that the emission calculation unit 120 functions as each calculation unit when the CPU executes programs corresponding to the respective calculation units stored in the storage unit. Each calculation unit of the emission calculation unit 120 may be realized by dedicated hardware (circuits, processors, etc.).

[0043] The calculation result display unit 140 is, for example, a monitor device, etc., and displays various calculation results and operation menus, etc. in this embodiment on the display. The input unit 150 is, for example, a keyboard or a mouse, etc., and receives operation instructions from the user.

[0044] <GHG Emission Calculation Method by Product> The emission calculation unit 120 performs the calculations in three patterns (Pattern 1 to Pattern 3) shown in Fig. 5A. (1) Pattern 1 calculates the GHG emissions by product by multiplying the emission factor (average value), which is the average value of each company for various products published in, for example, the input-output table or IDEA, etc., by the activity volume. It is mainly processed by the product-by-product GHG emission calculation unit 121 using the average factor. The calculation formula for Pattern 1 is as follows. (GHG emissions by product in Pattern 1) = (Emission factor (average value)) × (Activity volume) ··· (Formula 1) For example, when calculating the GHG emissions of "〇 Company"'s "Part AAA" using the data shown in Fig. 4, the GHG emissions of Supplier Name 401: "〇 Company", Part Name 403: "Part AAA" can be calculated as "31.86" by multiplying the Emission factor (average value) 405: "6.41" by the purchase amount 404: "4.97" as the activity volume.

[0045] (2) Pattern 2 is a characteristic calculation method in this embodiment. By dividing the company-level GHG emissions 114 provided by the supplier by the total amount of GHG emissions by product calculated from the multiplication of the emission factor (average value) and the activity volume, a supplier-specific correction factor (in this embodiment, this correction factor is referred to as the supplier factor) is derived. Similar to Pattern 1, the GHG emissions by product are calculated by correcting the value obtained by multiplying the emission factor (average value) and the activity volume with the supplier factor. Pattern 2 is mainly processed by the supplier factor calculation unit 122 and the product-by-product GHG emission calculation unit 123 using the supplier factor.

[0046] The calculation formula for Pattern 2 is as follows. (GHG emissions by product in Pattern 2) = (Emission factor (average value)) × (Activity volume) × (Supplier factor) ··· (Formula 2) (Supplier factor) = (Company-level emissions) / Σ((Emission factor (average value)) × (Activity volume)) ··· (Formula 3) For example, when calculating the GHG emissions of "Company △" by product using the data shown in Figure 4, first calculate the supplier coefficient according to Equation 3. Since the calculation of the denominator of Equation 3 is the sum of ((emission intensity (average value)) × (activity amount)) for each part, similar to Pattern 1, Part "Part AAC"; 9.29×10.20 = 94.76 ··· (a) Part "Part ABC"; 9.29×6.53 = 60.66 ··· (b) Part "Part ACC"; 8.95×6.70 = 59.97 ··· (c) The sum of these ((a)+(b)+(c)) is 215.39. And since the enterprise-level emissions amount in the numerator is "206.7", dividing this by "215.39" calculates the supplier coefficient as "0.96".

[0047] Next, calculate the GHG emissions by product according to Equation 2. In the calculation of the above-mentioned supplier coefficient, ((emission intensity (average value)) × (activity amount)) for each part has been calculated ((a)~(c)), so Part "Part AAC"; (a)×(supplier coefficient)=90.97 Part "Part ABC"; (b)×(supplier coefficient)=58.23 Part "Part ACC"; (c)×(supplier coefficient)=57.57 can be calculated as such.

[0048] Also, by calculating the supplier coefficient, it is possible to simply evaluate the GHG reduction efforts of that enterprise (supplier). That is, when the supplier coefficient is less than 1, it indicates that the GHG emissions of the supplier are less than the enterprise average value, and it can be evaluated that there is a possibility that the supplier has made certain efforts in reducing GHG emissions.

[0049] On the other hand, when the supplier coefficient is greater than 1, it indicates that the supplier's GHG emissions are higher than the corporate average, suggesting that there may be insufficient efforts in reducing GHG emissions. In this case, it is possible to support decision-making such as making further proposals for reducing the supplier's GHG emissions.

[0050] (3) Pattern 3 is used to calculate the product-specific GHG emissions by multiplying the activity volume by the emission factor when there is a product-specific GHG emission factor unique to the supplier (when receiving it from the supplier). It is mainly processed by the product-specific GHG emissions calculation unit 124 using the supplier-provided factor. The calculation formula for Pattern 3 is as follows. (Product-specific GHG emissions of Pattern 3) = (Emission factor (unique to the supplier)) × (Activity volume) ··· (Formula 4) For example, when calculating the GHG emissions of "Part ACC" of "Company △" using the data shown in Figure 4, the GHG emissions of part name 403: "Part ACC" of supplier name 401: "Company △" can be calculated as "34.44" by multiplying the emission factor (unique to the supplier) 406: "5.14" by the purchase amount 404: "6.70" as the activity volume.

[0051] Figure 5B shows the differences in the data used in the calculations for Patterns 1 to 3 and the characteristics of the results calculated for each pattern.

[0052] Pattern 1 can be calculated without receiving special data from the supplier by using data that can be obtained from the input-output table, IDEA, etc. However, the calculation accuracy may not always be good.

[0053] For Pattern 2, if there is enterprise-level emissions data that can be relatively easily obtained from the supplier, better calculation accuracy can be expected compared to Pattern 1. Furthermore, by calculating the supplier coefficient, the supplier's efforts in energy conservation can be simply inferred.

[0054] Pattern 3 uses the unique product-specific emission factor data provided by the supplier for calculation, so the best calculation accuracy can be expected. However, in the first place, there are many cases where the supplier cannot provide the data because it has not calculated the unique product-specific emission factor data, and the applicable situations are limited compared to Pattern 2.

[0055] <Processing Flow of GHG Emission Calculation Device> Hereinafter, the processing flow of the GHG emission calculation device in this embodiment will be described using the flowchart of FIG. 6.

[0056] In step S1, the component composition of the product is acquired. The acquisition of component information is performed from the BOM shown in FIG. 2F.

[0057] In step S2, related supplier information is acquired. The related supplier information is the supplier name, company-level emissions, component name, and purchase amount shown in FIG. 4.

[0058] In step S3, the component list is sorted for each company, and in step S4, the emission factor (average value) of the corresponding component is set.

[0059] Through the above steps S1 to S4, the supplier name 401, component name 403, purchase amount 404, and emission factor (average value) 405 in FIG. 4 are set in a predetermined area of the storage unit of the emission calculation unit 120.

[0060] In step S5, the product-specific GHG emissions are calculated by multiplying the purchase amount 404 corresponding to the activity level by the emission factor (average value) 405, and the result is stored in the calculation result storage unit 125 as the calculation result according to Pattern 1 (step S6).

[0061] In step S7, check whether there is a company-level GHG emission amount (whether it is provided by the supplier) from the obtained supplier information. If there is no company-level GHG emission amount (in step S7, "No"), further check in step S8 whether there is a product-specific GHG emission factor unique to the supplier. If not (in step S8, "No"), since the calculations according to pattern 2 and pattern 3 cannot be performed, proceed to step S17 and display only the calculation result according to pattern 1.

[0062] If there is a product-specific GHG emission factor unique to the supplier in step S8 (in step S8, "Yes"), multiply the purchase amount 404 corresponding to the activity volume by the product-specific GHG emission factor unique to the supplier to calculate the product-specific GHG emission amount (step S9), and store the result as the calculation result according to pattern 3 in the calculation result storage unit 125 (step S10). In this case, since the calculation results according to pattern 1 and pattern 3 can be obtained, proceed to step S17 and display both of them.

[0063] Return to step S7. If there is a company-level GHG emission amount (in step S7, "Yes"), calculate the supplier coefficient according to the above (Equation 3) (step S11).

[0064] Subsequently, in step S12, check whether there is a product-specific GHG emission factor unique to the supplier. If not (in step S12, "No"), multiply each value of the product-specific GHG emission amount calculated in step S5 by the supplier coefficient calculated in step S11 to calculate the GHG emission amount for each product (step S13), and store the result as the calculation result according to pattern 2, together with the supplier coefficient calculated in step S11, in the calculation result storage unit 125 (step S14). In this case, since the calculation results according to pattern 1 and pattern 2 can be obtained, proceed to step S17 and display both of them and the supplier coefficient.

[0065] Return to step S12. If there is a product-specific GHG emission factor unique to the supplier (Yes in step S12), then in steps S9 and S10, multiply the purchase amount 404 corresponding to the activity volume by the product-specific GHG emission factor unique to the supplier to calculate the product-specific GHG emissions (step S15), and store the result in the calculation result storage unit 125 as the calculation result by pattern 3 (step S16). Subsequently, proceed to steps S13 and S14, perform the calculation by pattern 2 in the same manner as described above, and store the result in the calculation result storage unit 125. In this case, since the calculation results by all of patterns 1 to 3 have been obtained, it is possible to proceed to step S17 and display all of these calculation results. However, if the display of the calculation result by pattern 2 is not necessary, the processes of steps S13 and S14 may be omitted after step S16.

[0066] Also, when the supplier coefficient can be calculated in step S11, in the result display process in step S17, by simultaneously displaying the supplier coefficient, it can be visualized as a basis for inferring the energy-saving efforts of the supplier.

[0067] <Display of GHG Emission Calculation Results> Figure 7 shows an example of the screen display of the results of calculating the product-specific GHG emissions. Figure 7 shows the supplier name 701, product name 702, part name 703, and corporate unit emissions 704 extracted from the supplier information management unit 110 for each supplier targeted for calculation, and further shows the supplier coefficient 705 and the results 706 of calculating patterns 1, 2, and 3 from the calculation result storage unit 125.

[0068] The calculation by pattern 1 is possible regardless of whether data on emissions from the supplier is provided, so for all companies, the calculation result 706A is shown.

[0069] On the one hand, since the enterprise-level emissions of Company 〇 and Company △ are provided to the enterprise and stored in the Supplier Information Management Department 110, the numerical values of both are shown in the column of enterprise-level emissions 704. Furthermore, since the calculation of CO2 emissions by product using the supplier coefficient of Pattern 2 was possible, the calculation result 706B is displayed in the column of supplier coefficient 705 and the column of Pattern 2.

[0070] In addition, for Company △, since a specific GHG emissions intensity is further provided, the calculation using Pattern 3 was also possible, so the calculation result 706C is also displayed in the column of Pattern 3.

[0071] On the other hand, for Company □, since there is no data provision from the supplier regarding specific enterprise-level emissions and emissions intensity, and it is not stored in the Supplier Information Management Department 110, only the calculation using Pattern 1 was possible, so only this result is displayed.

[0072] Furthermore, in the display example of Figure 7, the supplier coefficient 705 is also shown. By this, the status of the supplier's efforts to reduce GHG emissions can be simply evaluated (inferred). That is, since the supplier coefficients of Company 〇 and Company △ are smaller than "1", it is possible to evaluate (infer) that they are making more efforts to reduce GHG emissions compared to the average enterprises in the input-output table and IDEA. Also, since the supplier coefficient of Company 〇 is smaller than that of Company △, it is possible to evaluate (infer) that Company 〇 is making more efforts to reduce GHG emissions.

[0073] Note that the display method in Figure 6 is just an example. As long as there is a form that displays enterprise-level emissions, supplier coefficients, and emissions by product, it is possible to visualize the supplier's efforts to reduce GHG emissions and the GHG emissions by product, so it does not necessarily have to be the display form of Figure 7.

[0074] In the above description, the activity volume was used as the product amount and the unit cost was based on the amount. However, the activity volume can also be the product weight and the unit cost can be based on the weight. Fig. 8 shows the calculation formulas of calculation patterns 1 to 3 when the activity volume is the product weight and the unit cost is calculated based on the weight. Here, the unit of the emission factor per unit in each calculation formula is "t-CO2 / kg" and the unit of the activity volume is "kg / year", which is different from the calculation formula shown in Fig. 4B etc. In this case, the processing flow as the GHG emission calculation device is the same as the flowchart shown in Fig. 6.

[0075] As described above, according to this embodiment, it is possible to appropriately calculate and visualize the GHG emissions by product according to the data provision status of the GHG emissions from the supplier, and furthermore, it is possible to easily evaluate the efforts of the supplier to reduce GHG emissions.

Description of symbols

[0076] 100 GHG emission calculation device 110 Supplier information management department 111 Supplier name and product name DB 112 Product purchase amount DB 113 Product purchase weight DB 114 Enterprise unit GHG emission DB 115 Product unit GHG emission factor per unit DB 116 First management code DB 120 Emission calculation department 121 Product-by-product GHG emission calculation department using average unit cost 122 Supplier coefficient calculation department 123 Product-by-product GHG emission calculation department using supplier coefficient 124 Product-by-product GHG emission calculation department using supplier-provided unit cost 125 Calculation result storage department 130 Product information management department 131 Product BOM-DB 132 Emission factor per unit storage department 133 Second management code DB 140 Calculation result display department 150 Input section

Claims

1. A GHG emission calculation device for calculating the GHG emissions of a product, which multiplies the average value of the GHG emission per unit of the product by the activity amount of the product to calculate a first GHG emission which is the average value of the GHG emissions of the product, calculates a correction coefficient by dividing the GHG emissions of the enterprise unit related to the product by the sum of the first GHG emissions calculated for each product, and calculates a second GHG emission for each product by multiplying each of the first GHG emissions for each product by the correction coefficient. A GHG emission calculation device characterized by the above.

2. The GHG emission calculation device according to Claim 1, comprising a product BOM-DB for storing the component information of the product, and an emission per unit storage unit for storing the average value of the GHG emission per unit of the product, and a product information management unit; a supplier information management unit having a supplier name and product name DB, a product purchase amount DB, a product purchase weight DB, and an enterprise unit GHG emission DB in a supplier which is an enterprise that supplies the product to the enterprise; an emission calculation unit having a product-by-product GHG emission calculation unit using the average per unit, a supplier coefficient calculation unit for calculating a supplier coefficient as the correction coefficient, and a product-by-product GHG emission calculation unit using the supplier coefficient; wherein the first GHG emission is calculated by the product-by-product GHG emission calculation unit using the average per unit, and the second GHG emission is calculated by the supplier coefficient calculation unit and the product-by-product GHG emission calculation unit using the supplier coefficient. A GHG emission calculation device characterized by the above.

3. The GHG emission calculation device according to Claim 2, wherein the supplier information management unit has a product unit GHG emission per unit DB in which the specific value of the GHG emission per unit of the product in the supplier is stored, and the emission calculation unit has a product-by-product GHG emission calculation unit using the supplier-provided per unit, and calculates a third GHG emission which is the specific value of the GHG emission of the product by multiplying the specific value of the GHG emission per unit of the product by the activity amount of the product. A GHG emission calculation device characterized by the above.

4. The GHG emission calculation device according to Claim 3, comprising a calculation result display unit. A GHG emission calculation device, characterized in that when the GHG emissions of the enterprise unit are not confirmed, the first GHG emissions are calculated and displayed on the calculation result display unit. **Claim 5** The GHG emission calculation device according to claim 4, wherein when the GHG emissions of the enterprise unit are confirmed, the second GHG emissions are calculated and displayed on the calculation result display unit together with the first GHG emissions and the supplier coefficient. A GHG emission calculation device. **Claim 6** The GHG emission calculation device according to claim 4, wherein when the unique value of the GHG emission intensity per unit of the product is confirmed, the third GHG emissions are calculated and displayed on the calculation result display unit together with the first GHG emissions. A GHG emission calculation device. **Claim 7** The GHG emission calculation device according to claim 5, wherein when the unique value of the GHG emission intensity per unit of the product is confirmed, the third GHG emissions are calculated and displayed on the calculation result display unit together with the first GHG emissions, the second GHG emissions and the supplier coefficient. A GHG emission calculation device. **Claim 8** The GHG emission calculation device according to any one of claims 1 to 7, wherein the activity amount is the purchase amount of the product or the purchase weight of the product. A GHG emission calculation device. **Claim 9** A GHG emission calculation method for calculating the GHG emissions of a product, wherein the average value of the first GHG emissions, which is the average value of the GHG emissions of the product, is calculated by multiplying the average value of the GHG emission intensity per unit of the product by the activity amount of the product, a correction coefficient is calculated by dividing the GHG emissions of the enterprise unit related to the product by the sum of the first GHG emissions calculated for each product, and the second GHG emissions for each product are calculated by multiplying each of the first GHG emissions for each product by the correction coefficient. A GHG emission calculation method characterized by the above.

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