Integrated Index
"Sekisui Environmental Sustainability Index"

What is the Sekisui Environmental Sustainability Index?

The Sekisui Environmental Sustainability Index represents the impact on the environment of the activities of Sekisui Chemical Group companies (the use of natural capital) and their degree of contribution to the environment (returns to natural capital) as a single indicator. The major items for implementation in the medium-term plan—reducing various impacts on the environment, conserving the natural environment, and so forth—were integrated into this indicator; the Group began trial calculations in fiscal 2014. Starting in fiscal 2017, the “rate of return to natural capital,” as reflected in this index, is being used as a KPI to manage the overall progress of Group companies’ environmental management. The Group aims to achieve 87% in fiscal 2018 and 90% over the three-year period of the Medium-term Plan and has established returns of 100% or higher as its target for 2030.

Results of Calculation

The results of calculating the Sekisui Environmental Sustainability Index, utilizing results from fiscal 2018, are provided in the chart below. Setting the use of natural capital (the impact on the environment) at 100, the return of natural capital (contributions to the environment) was 92.8%. One of the factors in this achievement was reducing the impact on the environment by working on the supply chain, such as reducing SCOPE 3 greenhouse gas emissions, and expanding the sales of Environment-Contributing Products, including solar power-equipped houses and interlayers to address sound and heat insulation in vehicles. We plan to further increase the effectiveness of our various initiatives with the aim of achieving an even better return in 2019.
We aim for a “world in which biodiversity is conserved” by reaching a return rate to natural capital of 100% or higher by 2030 and thus achieving sustainable use of the earth’s natural capital.
Increasing the “product contribution,” as reflected in this index, and bringing about an improvement in the return to natural capital are also linked to improving the environmental efficiency of Sekisui Chemical Group customers.

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After compiling the raw data in (1), above, the damage calculation-based impact assessment method “LIME2,” developed for use in Japan by Professor Norihiro Itsubo of Tokyo City University, was employed for the calculations in stages (2) and (3).

Indicator Calculation Method
Sekisui Environmental Sustainability Index Sekisui Environmental Sustainability Index: Overall volume of returns of natural capital by the Group / Overall volume of usage of natural capital by the Group

Calculating the usage and return volumes of natural capital
Employing LIME2 (a damage calculation-based impact assessment method developed for use in Japan by Professor Norihiro Itsubo of Tokyo City University) and covering all the criteria for conservation defined by LIME2, the impacts on each of “human health (including the effects of global warming),” “societal assets (including the effects of global warming),” “the effects on plants (reducing interference on growth),” and “the effects on life (restricting the extinction of living species)” were evaluated and then made into a single indicator

The amount of return to natural capital was calculated as the reduction in the risk of harm to natural capital because of the whole Group’s various initiatives that contribute to the environment, relative to if these initiatives had not been implemented.

  • Items included in the calculation of the amount of natural capital used
    • Direct usage:
      Use of land, greenhouse gases, amounts of emissions into the air of PRTR substances and air pollutants, the COD volume of discharges into bodies of water
    • Indirect usage:
      Purchased raw materials*1, energy use, amount of water used, amount of waste material emitted, amount of GHGs emitted indirectly in supply chains (Scope 3)
  • Items included in the calculation of returns to natural capital
    Amount of contributions to reducing usage of natural capital through Environment-contributing Products, the amount of contribution from environmental conservation activities, environment-related donations, mega-solar power generation output
  • *1
    Until fiscal 2017, the Group gained an understanding of environmental impact, including the volume of greenhouse gasses emitted, by making calculations using “MiLCA,” the database furnished by the Japan Environmental Management Association For Industry. However, from fiscal 2018, the Group is reflecting the actual GHG emissions of its raw material suppliers with regard to four principal resins (PP, PE, PVC and PVA).

Scope of Calculation / Listing by category of calculation: Trial calculations were conducted using the following assumed conditions:
  • ・Raw materials:
    Purchased raw materials covered; estimates incorporated into calculations
    Concerning housing, the calculation includes the constituent raw materials for one structure multiplied by the number of structures manufactured
  • ・Manufacturing / Emissions of harmful chemical substances:
    〈Japan〉emissions of 1 t per year or
    more of substances covered under PRTR are included in the calculation. 〈Overseas〉Not included
  • ・Manufacturing / Land maintenance:
    Domestic plants and research facilities were incorporated into the calculation using the area of the premises, generally considered in terms of the land used for buildings*2. The areas of the premises of overseas plants were estimated. The effects of land usage are included in the calculation based on the 30-year period after the purchase of the land
  • *2
    Concerning land usage, starting with the current Medium-term Plan (2017-19), improvements to soil quality in the “JBIB Land Use Score Card®” were deemed as reductions of the impact of land usage, weighted accordingly, and included in the calculation.
  • ・Others:
    Capital goods in supply chains, other fuel- and energy-related activities, transport and shipping, waste, business trips, commuting by employees, leased assets (downstream), processing/use/disposal of sold products
    Business trips and commuting by employees: Covers consolidated numbers of employees and includes some estimation
    Use of sold products: Covers housing sold during the fiscal year, and included in the calculation with assumed energy usage for 60 years into the future
    Until fiscal 2017, the Group calculated the amount of greenhouse gas reduction achieved through solar power generation as the amount of reduced environmental impact. From fiscal 2018, however, we are also calculating the effect of reduction in energy used in residences built to zero energy house (ZEH) specifications.
    Processing of sold products: Energy usage by customers while processing products anticipated to consume large amounts of energy was estimated and included in the calculation
    Disposal of sold products: Major raw materials for each fiscal year were covered and included in the calculation based on the assumption that they would be made into products and disposed of during that fiscal year
  • ・Product contributions:
    (1) The differences in contribution to the environment between the relevant products and previous technologies were evaluated qualitatively for each criterion, based on the contribution to the natural and social environments for each life-cycle (the five stages of procurement of raw materials, manufacturing, distribution, usage/maintenance, disposal, and recycling) in terms of CO2 reductions and energy savings, reductions in waste materials, resource savings, water-savings and the water cycle, preventing pollution, direct preservation of biodiversity, QOL improvements, and other factors. For factors for which a significant difference was estimated, data per product unit was investigated.
    (2) Based on the results of these investigations, a coefficient for calculating the impact on the environment for each series of data was multiplied by the data, yielding a calculation of the degree of contribution to the environment of each product unit.
    (3) The sales results for products in each fiscal year were multiplied by the results found in (2) to calculate the degree of contribution to the environment for each product, and the results were included in the calculation. Trial calculation performed on the effects of products equivalent to around 75% of Environment-contributing Products
  • ・Direct contribution / Contribution from activities reducing environmental impacts:
    The effects on the environment relating to production for each fiscal year were compared to “the effects on the environment relating to manufacturing in fiscal 2016 × (revenue in that fiscal year / revenue in fiscal 2016),” and the difference was included in the calculation. There was a proportional relationship between revenue and the effects on the environment relating to manufacturing, based on the idea that the difference was the result of efforts undertaken in the group's activities.
  • ・Direct contribution / Conservation of the natural environment:
    The Group keeps track of the number of participants and the amount of time spent on each activity. In the case of planting cedar trees, a fixed amount of CO2 (1.1 t-CO2/person-hour) was multiplied by the number of people and the amount of time spent and incorporated into the calculation. Because, starting with the current medium-term plan (2017-19), improving the sustainability of activities through local cooperation and by making them stand on their own (autonomous) were made a target, the Group’s ability to work toward this target was weighted against the growth axis and included in the calculation
  • ・Direct contributions / donations:
    The amount intended to be paid for conservation was deemed equal to the amount of money calculated for damage caused and included in the calculation.
  • ・Direct contribution / Mega-solar:
    Amount of electricity generated included in the calculation as generated energy converted to a CO2 basis