Greenhouse gas emission display system and greenhouse gas emission display program

Abstract

To provide a greenhouse gas emission display system capable of easily comparing greenhouse gas emissions of a plurality of construction materials.SOLUTION: The greenhouse gas emission display system 1 collectively displays greenhouse gas emissions of a plurality of construction materials. The system includes a building material registering section 31 for registering building materials together with at least information on reduction rates of greenhouse gases emissions, a building material selecting section 32 for displaying the building materials registered by the building material registering section in a selectable manner, a basic unit setting section 33 for setting a CO2 basic unit to be used for display, an emission converting section 34 for calculating converted greenhouse gases emissions based on the CO2 basic unit and the reduction rates set by the basic unit setting section, and a display control section 35 for displaying the building materials and the converted greenhouse gases emissions.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a greenhouse gas emission display system and a greenhouse gas emission display program that collectively display the greenhouse gas emissions of a plurality of construction materials. [Background technology]

[0002] As disclosed in Patent Documents 1 and 2, as consideration for the global environment is required, the increase in greenhouse gas emissions such as carbon dioxide emissions (CO2 emissions) and their impacts have become a problem.

[0003] Patent documents 1 and 2 state that the total carbon dioxide emissions of construction materials used in a building can be calculated by adding up the carbon dioxide emissions calculated based on the quantity of construction materials used and the CO2 intensity of the construction materials (CO2 emissions per unit amount).

[0004] On the other hand, the CO2 intensity units used to calculate the CO2 emissions of buildings are issued by various organizations, and the figures issued by each organization are different. The calculation person can decide which CO2 intensity unit to use, and currently, each company that supplies construction materials uses its own CO2 intensity unit (see Patent Document 3). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-265178 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-245202 [Patent Document 3] Japanese Patent Application Publication No. 2023-177445 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the CO2 emissions of construction materials calculated using different CO2 intensity units cannot be directly compared, and if greenhouse gas emissions are added to the selection criteria for construction materials, conversion will be necessary to make them comparable.

[0007] Therefore, an object of the present invention is to provide a greenhouse gas emission display system and a greenhouse gas emission display program that enable easy comparison of greenhouse gas emissions of multiple construction materials. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the greenhouse gas emission display system of the present invention is a greenhouse gas emission display system that collectively displays the greenhouse gas emissions of multiple construction materials, and is characterized by comprising: a building material registration unit that registers construction materials along with information regarding at least the greenhouse gas emission reduction rate; a building material selection unit that makes the construction materials registered by the building material registration unit selectable and displays them; a unit setting unit that sets the CO2 intensity to be used for display; an emission conversion unit that calculates a conversion value of greenhouse gas emissions for the construction materials selected by the building material selection unit based on the CO2 intensity and the reduction rate set in the unit setting unit; and a display control unit that displays the construction materials and the conversion value.

[0009] Here, when information relating to the cost of the construction material is registered in the building material registration unit, the display control unit can be configured to display the cost information together with the conversion value.

[0010] In addition, when the building material registration unit registers physical quantity information regarding the greenhouse gas emissions of the construction material, the emission conversion unit can be configured to convert the physical quantity information into the same unit as the CO2 intensity set by the intensity setting unit.

[0011] The invention of the greenhouse gas emission display program is a greenhouse gas emission display program for collectively displaying the greenhouse gas emissions of multiple construction materials, and is characterized in that it causes a computer to execute the following steps: registering construction materials along with information regarding at least the greenhouse gas emission reduction rate; making the registered construction materials selectable and displaying them on a display device; setting a CO2 intensity unit to be used for display; calculating a greenhouse gas emission conversion value for the selected construction materials based on the set CO2 intensity unit and the reduction rate; and displaying the construction materials and the conversion value on the display device. [Effects of the Invention]

[0012] The greenhouse gas emission display system of the present invention configured as described above has a building material registration unit that registers construction materials and registers information related to greenhouse gas emission reduction rates. The emission conversion unit calculates a conversion value for greenhouse gas emissions based on the CO2 intensity and reduction rate set in the intensity setting unit. The display control unit then displays the conversion value for the construction material selected in the building material selection unit.

[0013] Therefore, the greenhouse gas emissions of multiple selected construction materials are displayed using the same standard, using the set CO2 intensity, making it easy to compare which construction materials have the lowest greenhouse gas emissions.

[0014] Furthermore, if information on the cost of construction materials is registered in the Building Materials Registration Department, it will be possible to compare costs along with greenhouse gas emissions, making it easier to understand the cost-to-greenhouse gas emission reduction effect.

[0015] Furthermore, when quantitative information on greenhouse gas emissions of construction materials is registered in the building materials registration section, the information can be converted into the same unit as the set CO2 basic unit and displayed, making it possible to compare the greenhouse gas emissions of multiple construction materials in the same quantitative unit.

[0016] The invention of the greenhouse gas emission display program functions to have a computer execute the steps of registering construction materials along with information regarding the greenhouse gas emission reduction rate, and displaying the converted greenhouse gas emission value calculated based on the set CO2 intensity and reduction rate, thereby making it possible to easily compare the greenhouse gas emissions of multiple construction materials using the same standard. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a block diagram illustrating the configuration of a greenhouse gas emission amount display system according to an embodiment of the present invention. [Figure 2] FIG. 10 is an explanatory diagram illustrating a plurality of construction materials for which information on greenhouse gas emissions is registered. [Figure 3] FIG. 10 is an explanatory diagram illustrating an example of a screen for registering a reduction rate of greenhouse gas emissions. [Figure 4] FIG. 10 is an explanatory diagram illustrating a screen for setting a CO2 standard value to be used for display. [Figure 5] FIG. 10 is an explanatory diagram for comparing a conversion value calculated from a reduction rate and a CO2 standard value with a registered value. [Figure 6] FIG. 10 is an explanatory diagram illustrating a process for collectively displaying greenhouse gas emissions of a plurality of construction materials. [Figure 7] FIG. 10 is an explanatory diagram illustrating an example of the greenhouse gas emissions of multiple construction materials registered in different units of quantity displayed together. [Figure 8] FIG. 10 is an explanatory diagram showing a graph displaying the CO2 emissions and costs of a number of construction materials. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating the configuration of a greenhouse gas emission display system 1 according to this embodiment.

[0019] The greenhouse gas emission display system 1 of this embodiment displays the amount of greenhouse gas emissions such as carbon dioxide related to construction materials used in constructing buildings, structures, etc. In other words, the construction materials that make up buildings, etc., are often sold as multiple products by various manufacturers, etc., and by displaying the greenhouse gas emissions of these multiple construction materials together, it becomes easier for designers and others to compare the amount of greenhouse gas emissions such as carbon dioxide emissions.

[0020] Construction materials (hereinafter sometimes abbreviated as "building materials") are classified as Scope 3 Category 1 (emissions from purchased and acquired raw materials) for construction companies, for example, under the GHG Protocol, an international standard for calculating and reporting greenhouse gas (GHG) emissions.

[0021] For construction materials, a basic unit (CO2 basic unit) is set that indicates the amount of carbon dioxide emissions (CO2 emissions) per unit of material. CO2 basic units can be calculated independently by building material manufacturers, or they can obtain and use those created by third parties.

[0022] On the other hand, various low-CO2 building materials (building materials with lower CO2 emissions than conventional materials) are being sold by building material manufacturers and other companies. When trying to search and compare these on a web system, if different CO2 intensity units are used for each building material and listed as CO2 emissions, it becomes difficult for viewers such as designers at construction companies to compare them.

[0023] Therefore, in the greenhouse gas emission display system 1 of this embodiment, the CO2 emissions of low-CO2 building materials and the like are converted to match the CO2 intensity that the viewer wants to use, making it easy to compare the CO2 emissions of multiple building materials.

[0024] As shown in FIG. 1, the greenhouse gas emission display system 1 of this embodiment includes a calculation processing unit 3 that performs calculation processing based on input information from an input device 2 or the like, and the calculation processing unit 3 is connected to a memory unit 4, a display device 5 such as a display, and the like.

[0025] The greenhouse gas emission display system 1 is connected to the outside via a network NW such as the Internet. The network NW is configured by some or all of the Internet, a wide area network (WAN), a wired local area network (LAN), a wireless LAN (Wi-Fi), a provider device, a wireless base station, a dedicated line, etc.

[0026] Viewers who wish to compare the CO2 emissions (greenhouse gas emissions) of multiple construction materials can access the greenhouse gas emission display system 1 using a viewer terminal 6 connected to the network NW.

[0027] In addition, company personnel such as building material manufacturers who wish to register their construction materials in the greenhouse gas emission display system 1 can access the greenhouse gas emission display system 1 using a manufacturer terminal 7 connected to the network NW.

[0028] There are no particular limitations on the configuration of the viewer terminal 6 and the manufacturer terminal 7, but personal computers (PCs), notebook computers, tablet terminals, wearable devices, smartphones, etc. The viewer terminal 6 and the manufacturer terminal 7 are each equipped with an input device and a display device similar to the input device 2 and the display device 5, which will be described later.

[0029] The input device 2 of the greenhouse gas emission display system 1 may be, for example, a keyboard, a mouse, a touch panel, a touch pad, a scanner, a microphone for voice input, a camera, or the like.

[0030] The storage unit 4 is a storage medium that records data generated during processing in the arithmetic processing unit 3 and data required for arithmetic processing, and includes a hard disk, a solid state drive (SSD), a flash memory (such as an SD memory card), a magnetic disk, an optical disk, etc. An external online storage (cloud storage) such as a server connected via a network NW can also be used as the storage unit 4.

[0031] On the other hand, a liquid crystal display, an organic EL (Electro-Luminescence) display, a printer, etc. can be used as the display device 5. The display device that displays various information and conversion values ​​of construction materials by a display control unit 35 (described later) may also refer to the display device of the viewer terminal 6 or the manufacturer terminal 7.

[0032] The arithmetic processing unit 3 is configured as computer hardware such as a CPU (Central Processing Unit), MPU (Micro-processing unit), GPU (Graphics Processing Unit), etc., and is equipped with memories such as RAM (Random Access Memory) and ROM (Read Only Memory).

[0033] The arithmetic processing unit 3 can execute various functions using applications such as a greenhouse gas emission display program installed on a computer. Also, part or all of the arithmetic processing unit 3 can be executed by a server connected via a network NW such as the Internet.

[0034] The calculation processing unit 3 of the greenhouse gas emission display system 1 of this embodiment includes a building material registration unit 31, a building material selection unit 32, a basic unit setting unit 33, an emission conversion unit 34, and a display control unit 35.

[0035] The building material registration unit 31 registers construction materials for displaying CO2 emissions in the greenhouse gas emission display system 1. It is assumed that the registration of construction materials will be performed by building material manufacturers or the like using the manufacturer terminal 7, but it is also possible to register construction materials from the input device 2 of the greenhouse gas emission display system 1 or the viewer terminal 6.

[0036] Figure 2 is an explanatory diagram illustrating a number of construction materials for which information on greenhouse gas emissions has been registered. Construction materials include a wide variety of components, such as concrete, reinforcing bars, glass, deck plates, steel frames, aluminum sashes, raised access floors, metal sandwich panels, ALC panels, SD (heavy steel doors), LGS (light gauge steel frames), rock wool, system ceilings, gypsum boards, tiles, crushed stone, and stone.

[0037] Figure 2 shows an example of the search panel, which allows users to easily search for various types of registered construction materials by category, part, or free word. Users can also select whether or not the calculation basis for CO2 emissions has been certified by a third party.

[0038] For construction materials registered in the building material registration unit 31, information on greenhouse gas emissions is stored in addition to the name, classification, area where it is used, product description, etc. Each building material manufacturer inputs the CO2 intensity and greenhouse gas emission reduction rate that they use from the manufacturer terminal 7.

[0039] 3 is an explanatory diagram illustrating an example of a registration screen displayed on the display device of the manufacturer terminal 7 by the display control unit 35, which will be described later. The person operating the manufacturer terminal 7 inputs at least the greenhouse gas emission (CO2 emission) reduction rate (CO2 reduction rate) for the construction material to be registered in the greenhouse gas emission display system 1.

[0040] On the other hand, building material manufacturers can use any CO2 intensity unit they like, and can calculate CO2 emissions independently, or they can obtain and use one created by a third party. In the input screen shown as an example in Figure 3, the input field for the CO2 intensity unit used by building material manufacturers is displayed as a "registered intensity unit" to distinguish it from other CO2 intensity units. Input of this registered intensity unit information is optional. When inputting a registered intensity unit, a physical quantity unit (such as "kg-CO2 / m2" in Figure 3) can also be specified.

[0041] Although not shown in Fig. 3, it may be possible to input the raw value of the CO2 emissions of the construction material to be registered and the amount of reduction in CO2 emissions from the registration screen displayed on the display device of the manufacturer terminal 7. The registered basic unit shown in Fig. 3 as an example will be used by multiplying it by the reduction rate, etc., as will be described later, but it is also possible to register the raw values ​​of the CO2 emissions and reduction in CO2 emissions of the construction material.

[0042] The building material selection unit 32 displays the construction materials registered by the building material registration unit 31 in a selectable manner. In the display example of Fig. 2, three construction materials are displayed in a selectable manner. For low-carbon building material A, information is displayed that the CO2 emissions are 70 kg-CO2 / m2 and the reduction rate is 30%, for low-carbon building material B, information is displayed that the CO2 emissions are 80 kg-CO2 / m2 and the reduction rate is 20%, and for low-carbon building material C, information is displayed that the CO2 emissions are 90 kg-CO2 / m2 and the reduction rate is 10%.

[0043] A viewer using the viewer terminal 6 can select the building materials for which they wish to display and compare their CO2 emissions from among the construction materials displayed by the building material selection unit 32, as shown in Figure 2. They can also select all of the displayed building materials by searching by category or part. For example, Figure 2 can be seen as a screen displaying the building materials selected by search, etc., in list format.

[0044] The CO2 intensity unit setting unit 33 allows the viewer to set the CO2 intensity unit they wish to use for display. Figure 4 is an explanatory diagram showing an example of a screen for setting the CO2 intensity unit to be used for display. The viewer, like the building material manufacturer, can arbitrarily select the CO2 intensity unit they wish to use from among the CO2 intensity units issued by various organizations.

[0045] The CO2 intensity used by the viewer can be set for each component. Figure 4 shows examples of components such as concrete, reinforcing bars, and steel frames, and the CO2 intensity used for display is labeled "CO2 standard value" to distinguish it from other CO2 intensity values.

[0046] The CO2 standard value field allows you to enter a numerical value. The unit of the CO2 standard value can also be entered in the adjacent field. Furthermore, as will be described later, if you want to specify the physical unit to be used for display, you can set the unit in the physical unit field.

[0047] The emission amount conversion unit 34 calculates a conversion value of the CO2 emission amount based on the CO2 standard value, which is the CO2 intensity unit set by the viewer, and the CO2 reduction rate registered by the building material data registrant. Fig. 5 is an explanatory diagram comparing the conversion value calculated from the CO2 reduction rate and the CO2 standard value with the registered value.

[0048] Information about the CO2 emissions of each building material is entered by the building material data registrant from the manufacturer terminal 7. The registered basic unit used by the building material data registrant is 100 kg-CO2 / m2, and the reduction rate is 30%, so the CO2 emissions are 70 kg-CO2 / m2.

[0049] On the other hand, the CO2 standard value set by the viewer is 120 kg-CO2 / m2. In this case, the conversion value is 120 x (100 - 30)%, which is 84 kg-CO2 / m2. Therefore, if the converted value is displayed as the calculated value, the CO2 emissions of the construction materials registered by the building materials data registrant will be 84 kg-CO2 / m2. In contrast, if the registered value registered by the building materials data registrant is displayed as the calculated value, the CO2 emissions will be 70 kg-CO2 / m2.

[0050] In this way, two different CO2 emissions are obtained for the same construction material. This is because the CO2 intensity unit used by the building material data registrant is different from the CO2 intensity unit used by the viewer. Both values ​​can be said to be correct calculations in accordance with LCA calculation rules.

[0051] Figure 6 is an explanatory diagram showing an example of the results of displaying the greenhouse gas emissions of multiple construction materials together. When building material data registrant A registered low-carbon building material A, the registered basic unit used was 100 kg-CO2 / m2, with a reduction rate of 30%, so the CO2 emissions of low-carbon building material A are 70 kg-CO2 / m2. On the other hand, when building material data registrant B registered low-carbon building material B, the registered basic unit used was 150 kg-CO2 / m2, with a reduction rate of 40%, so the CO2 emissions of low-carbon building material B are 90 kg-CO2 / m2.

[0052] Because the registered basic units used for low-carbon building material A and low-carbon building material B are different, it is difficult to compare the CO2 emissions displayed as is. On the other hand, the CO2 basic units that viewers want to use are also different, so the CO2 standard value is set to 120 kg-CO2 / m2 to compare the two building materials.

[0053] If the CO2 standard value is 120 kg-CO2 / m2, the equivalent value for low-carbon building material A is 120 x (100 - 30)%, or 84 kg-CO2 / m2. The equivalent value for low-carbon building material B is 120 x (100 - 40)%, or 72 kg-CO2 / m2. When converted using the same CO2 standard value, it is easy to see that low-carbon building material B emits less CO2 than low-carbon building material A.

[0054] In contrast, if the registered values ​​registered by building material data registrants A and B were displayed as calculated values, the CO2 emissions of low-carbon building material A would be 70 kg-CO2 / m2, and the CO2 emissions of low-carbon building material B would be 90 kg-CO2 / m2. In other words, the CO2 emissions of low-carbon building material A would be less than those of low-carbon building material B, contrary to the comparison using converted values.

[0055] This is due to the different CO2 intensity units used by building material data registrants A and B, but it cannot be said that the display is appropriate when comparing the CO2 emissions of two low-carbon building materials A and B. Therefore, by converting the CO2 emissions of the two low-carbon building materials A and B using the same CO2 standard value and displaying them, it will be possible to make comparisons easier.

[0056] When the building material registration unit 31 registers physical quantity information related to the greenhouse gas emissions of construction materials, the emission conversion unit 34 can convert the physical quantity information into the same unit as the CO2 reference value, which is the CO2 intensity unit set by the viewer. The physical quantity information corresponds to the physical quantity unit and the CO2 emission amount itself.

[0057] 7 is an explanatory diagram showing an example of the results of displaying the CO2 emissions of multiple construction materials (construction material A, construction material B, construction material C) registered in different units of quantity together. For example, construction material A has a registered CO2 emission amount of 10 kg-CO2 / m2 in the unit of quantity m2, construction material B has a registered CO2 emission amount of 50 kg-CO2 / m3 in the unit of quantity m3, and construction material C has a registered CO2 emission amount of 160 kg-CO2 / kg in the unit of quantity kg.

[0058] The three building materials A, B, and C have different units of measurement, so their CO2 emissions cannot be directly compared. However, the viewer has specified the unit of measurement as m2 for this type of construction material (see Figure 4).

[0059] In such a case, the emission amount conversion unit 34 uses the unit conversion database recorded in the storage unit 4 to convert the CO2 emission amount of each of the building materials A, B, and C into a physical quantity unit designated by the viewer.

[0060] For building material A, the physical quantity unit specified by the viewer is the same as the registered physical quantity unit, so the CO2 emissions are displayed as 10 kg-CO2 / m2. On the other hand, for building material B, m3 is used as the physical quantity unit, so the unit conversion database is used to divide the registered value by 1 / 10, displaying a CO2 emissions of 5 kg-CO2 / m2. Also, for building material C, kg is used as the physical quantity unit, so the unit conversion database is used to divide the registered value by 1 / 20, displaying a CO2 emissions of 8 kg-CO2 / m2.

[0061] In this way, even if the physical quantity units of the registered values ​​of multiple construction materials are different, the viewer can convert each to the physical quantity unit set in the basic unit setting section 33, and the CO2 emissions will be displayed in the same unit, making it easy to compare them.

[0062] The display control unit 35 performs processing to display the construction materials and the conversion values ​​on the display device of the viewer terminal 6. Furthermore, when information on the cost of construction materials is registered in the building material registration unit 31, the display control unit 35 can perform processing to display the cost information together with the conversion value.

[0063] Figure 8 is an explanatory diagram showing an example of displaying the CO2 emissions and costs of multiple construction materials. The vertical axis of the graph shown in Figure 8 is CO2 emissions (kg-CO2) and the horizontal axis is price (yen). The CO2 emissions of construction materials displayed on this graph are converted based on the CO2 standard value set by the viewer.

[0064] The plots indicated by black circles (●) on this graph show the relationship between the CO2 emissions and cost (price) of the building material selected by the viewer in the building material selection section 32. When the viewer moves the cursor on the viewer terminal 6 close to the plot of the building material that they want to focus on, detailed information can be displayed, such as low-carbon building material A or low-carbon building material C.

[0065] When comparing the CO2 emissions of multiple construction materials in this way, if the CO2 emissions of all building materials are displayed in a visualized graph using converted values ​​based on the CO2 standard value set by the viewer, the CO2 emissions can be compared at a glance.

[0066] Furthermore, if cost information is also displayed in the visualized graph, it will be possible to decide on construction materials to use while taking into account not only low CO2 emissions but also the costs involved in reducing them.

[0067] Next, the operation of the greenhouse gas emission amount display system and the greenhouse gas emission amount display program according to this embodiment will be described.

[0068] The greenhouse gas emission display system 1 of this embodiment configured as described above registers information about the reduction rate of CO2 emissions in the building material registration unit 31, which registers construction materials. The emission conversion unit 34 calculates a converted value of CO2 emissions based on the CO2 emission intensity (CO2 standard value) and the CO2 reduction rate set in the intensity setting unit 33. The display control unit 35 then displays the converted value of the construction material selected in the building material selection unit 32 on the display device of the viewer terminal 6.

[0069] Therefore, the CO2 emissions of multiple selected construction materials are displayed using the same standard, which uses the CO2 standard value set by the viewer, making it easy to compare which construction materials have the lowest CO2 emissions.

[0070] Furthermore, if information regarding the cost (price) of construction materials is registered in the building materials registration unit 31, it will be possible to compare costs along with CO2 emissions, making it easier to understand the cost-to-CO2 emission reduction effect.

[0071] Furthermore, when the building material registration unit 31 registers the quantity information regarding the CO2 emissions of construction materials, the quantity information can be converted into the same units as the CO2 standard value and displayed, making it possible to compare the CO2 emissions of multiple construction materials in the same quantity units.

[0072] Furthermore, in the greenhouse gas emission display program of this embodiment, construction materials are registered along with information regarding the CO2 emission reduction rate, and the converted CO2 emission value calculated based on the CO2 standard value and reduction rate is displayed, making it possible to easily compare the CO2 emissions of multiple construction materials using the same standard.

[0073] The embodiments of the present invention have been described above in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes that do not deviate from the gist of the present invention are included in the present invention.

[0074] For example, in the above embodiment, the greenhouse gas emissions were mainly described as CO2 emissions, but this is not limited to this, and the greenhouse gas emissions display system 1 and the greenhouse gas emissions display program can also be applied when displaying emissions of greenhouse gases other than carbon dioxide. [Explanation of symbols]

[0075] 1: Greenhouse gas emissions display system 31: Building Materials Registration Department 32: Building material selection section 33: Basic unit setting section 34: Emissions conversion department 35: Display control section

Claims

1. A greenhouse gas emission display system that collectively displays the greenhouse gas emissions of multiple construction materials, a building material registration unit that registers construction materials together with information on at least the greenhouse gas emission reduction rate; a building material selection unit that displays the construction materials registered by the building material registration unit in a selectable manner; a unit of measurement setting section for setting a CO2 unit of measurement to be used for display; an emission conversion unit that calculates a conversion value of greenhouse gas emissions for the construction material selected by the building material selection unit based on the CO2 intensity set by the intensity setting unit and the reduction rate; a display control unit that displays the construction material and the conversion value.

2. The greenhouse gas emission display system described in claim 1, characterized in that when information regarding the cost of the construction material is registered in the building material registration unit, the display control unit displays the cost information along with the conversion value.

3. The greenhouse gas emission display system according to claim 1 or 2, characterized in that when the building material registration unit registers quantity information regarding the greenhouse gas emissions of the construction material, the emission conversion unit converts the quantity information into the same unit as the CO2 intensity set by the intensity setting unit based on the quantity information.

4. A greenhouse gas emission display program for collectively displaying greenhouse gas emissions of a plurality of construction materials, a procedure for registering construction materials with information on at least the percentage reduction in greenhouse gas emissions; a step of displaying the registered construction materials on a display device in a selectable manner; The procedure for setting the CO2 intensity to be displayed, calculating a conversion value of greenhouse gas emissions for the selected construction materials based on the set CO2 intensity and the set reduction rate; and a procedure for displaying the construction material and the conversion value on the display device.

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