Environmental Report

Response to Global Warming

ISO 6.5.5 Climate change mitigation and adaptation
GRI EN15,EN16,EN17,EN18,EN19,EN27

CO2 emissions

Prediction of CO2 emissions in the building operation stage and reduction percentage

1 Global standard for calculation and reporting of Greenhouse Gas (GHG) emissions (URL: http://www.ghgprotocol.org/)

2 Calculation range criteria set by the Japan Federation of Construction Contractors

Scope 3

Taisei Corporation received third-party assurance for the Scope 1, 2, and 3 emissions calculated utilizing industry organization criteria.
Using the GHG protocol criteria, we calculate 10 categories related to our business out of the total of 15 categories, in which the emissions were approximately 28.7 million t-CO2. The emissions from the use of products sold are the highest, and carbon reduction of buildings is increasingly important.

Disclosure of Environmental Information

In FY2015, we were selected as a leading disclosure company for the CDP*3 Climate Disclosure Leadership Index (CDLI) for the sixth consecutive year since 2010.
We also participated in the project for the development of infrastructure for environmental information disclosure led by the Ministry of the Environment since 2013.
We will continue to actively disclose our environmental information.

3 CDP: A not-for-profit organization based in the U.K. that sends questionnaires on environmental strategies, GHG emissions, etc. to leading companies around the world and analyzes and evaluates their answers, and publishes the results to investors.

For the Creation of a Low Carbon Society

In recent years, we have been feeling the impacts of global warming and associated climate change more closely, such as landslides caused by extreme torrential rain. While such factors create various environmental risks in continuing corporate activities, they may also provide business opportunities by solving and responding appropriately using technology and initiatives.
The Taisei Corporation Group is making efforts to reduce carbon emissions at all stages of the life cycle from planning and design to construction, operation, renovation, and demolition.
Carbon reduction through the EMS operation, the development of materials that help reduce carbon emissions such as concrete using a reduced amount of cement, and the development of zero-energy buildings (ZEB) and other cutting-edge technologies for energy management and carbon reduction contribute not only to the prevention of global warming, but also to the effective use of natural resources and the reduction of the impact on the natural environment.
Taisei Corporation is carrying out our own "CO2 Zero Action" at all construction sites including building construction and civil engineering, which include activities in seven areas such as the eco-driving of construction machinery and vehicles and the effective use of rainwater.
We are also distributing information on the environmental initiatives through industry groups and the Eco First Promotion Counsel, etc., and we support "COOL CHOICE," a new national movement that will continue until 2030 on the theme of climate change measures and greenhouse gas reduction in the area of carbon reduction.
Additionally, the "Light-down Campaign" organized by the Ministry of the Environment for energy saving has been joined by more than 100 places such as head offices, branch offices, construction sites, etc., and from 2016, on the day of the event, CO2 emission offset using green power has been implemented at the head office, where the power consumption is the highest.

Key technologies and initiatives (examples)
Planning and design
  • T-ZEB simulator
  • Air-conditioner using geothermal energy
  • Liquid cooling air-conditioning system
  • Gravel layer boring using multilayered tip bits
  • Upward shield construction method
  • T-Root®
Operation, renovation and demolition
  • T-Green BEMS®
  • T-Green Monitor
  • ZEB renewal
Application of R&D technology
  • T-BIM cloud system
  • Breeding water recycling system

The "CO2 Zero Action" logo sign is affixed to the temporary enclosures of all construction sites, and the "COOL CHOICE" logo is posted at some of the construction sites.


Contribution to realizing Low Carbon Society

  • Environment Division

Taisei Corporation is implementing an environmentally friendly design in an effort to reduce the estimated CO2 emissions at the stage of building operations. We have also set the intensity targets (emissions per construction turnover) for the CO2 emissions at the construction stage, and all construction sites throughout Japan are striving to reduce the environmental impact and CO2 emissions during construction.

Reduction Rate of Predicted CO2 Emissions in the Building Operation Stage ・・・41.7%
Reduction Rate of CO2 Emissions in the Construction Stage ・・・52.7%

Effective Utilization of Resources

ISO 6.5.4 Sustainable resource use

Quantity of construction waste

Construction waste treatment breakdown

Emissions and recycling rate by construction waste category

Unit: 103t

Construction waste Civil engineering Building construction Total Recycling rate
New construction Demolition Subtotal
Concrete remnants 201 244 601 845 1,046 100.00%
Asphalt and concrete remnants 60 38 45 84 143 99.7%
Construction site sludge 335 417 28 445 781
Mixed waste 8 36 10 45 54 72.9%
Wood scrap 21 8 6 14 35 98.1%
Metal scrap 3 46 18 64 67 99.8%
Miscellaneous 33 68 58 126 158 65.4%
Total 661 857 766 1,623 2,284


Promotion of 3R* Activities and Green Procurement

  • Environment Division

In FY 2015, the final disposal rate of construction waste excluding polluted mud and waste not originating from the Company was 4.7%. Also, the green procurement percentage calculated from procurement data was 28.7%, as a result of operation of the "Green Procurement Guidelines".

Final Disposal Rate of Construction Waste ・・・4.7%

3R: Reduce / Reuse / Recycle

For the Creation of a Resource-recycling Society

All materials used in the construction business are produced, in a broad sense, through the consumption of limited natural resources, and Japan relies on imports for most of the raw materials. This is susceptible to significant risks in business continuity such as the interruption of supply due to disasters caused by extreme climate phenomena. The effective use and recycling of resources require efforts on a global scale, which are also included in the Sustainable Development Goals (SDGs)*1 announced in 2015.
The Taisei Corporation Group strives to make effective use of resources at all stages from planning and design to procurement to construction. We are contributing to the creation of a recycling society through, for instance, the adoption and use of recycled materials such as cement and steel materials that are key materials for construction, the adoption of the precast concrete (PCa) construction method, which is resource- and energy-saving and effective for reducing the environmental impact, raising the recycling rate by thoroughly sorting construction waste during demolition and disposal, and the active use of resource recycling through the sale of valuable materials.

1 SDGs: The acronym of Sustainable Development Goals. At the "United National Sustainable Development Summit 2015," member countries adopted SDGs comprising 17 objectives and 169 targets to accomplish on a global basis.

Key technologies and initiatives (examples)
Planning and designing
  • T-RESPO construction method®
  • Automatic warehouse rack seismic vibration control system
  • Eco-friendly concrete
  • Corrugated air ducts
  • E-DAM
  • Effective use and re-use of soil generated in construction
  • Super strong concrete with a compressive strength exceeding 300N
Operation, renovation, and demolition
  • Efficient use of concrete debris
  • Foundation pillar assessment system
  • Post-Head-Anchor®
  • Short-stroke seismic isolation system (urban-type)
Application of R&D Technology
  • Super green concrete
  • T-WOOD OA floor
  • Reuse of bits

Guidelines for Green Procurement

Taisei Corporation's "Taisei Corporation Green Procurement Guidelines" were established and operated in 2001 for the purpose of adopting materials and equipment and applying construction methods with low environmental impact during the design, construction, operation, and demolition of buildings. By referring to and reflecting the details of the Green Purchasing Law*2, the items and construction methods (green procurement items) are selected every year. In FY2015, the number of items was 85, including construction, equipment, and civil engineering.
The application in the entire company helps not only the recycled use of resources, but also energy saving, the reduction of CO2 emissions, resource conservation, the non-use of hazardous materials, preservation of the natural environment, etc.
Selecting materials, products, and construction methods with a low environmental impact during the design of buildings reduces not only the environmental impact during production and construction, but also the environmental impact and operation cost when customers use the buildings.
In FY2015, 7.7 items on average were adopted per building design project. Many of such items are water-saving hygiene equipment, LED lighting, and high-efficiency, energy-saving electric appliances.
Taking into account the past achievements, we have increased the target number of green procurement items per project to nine or more in our environmental management goals (Taisei Agenda) from FY2016, and we further encourage environmentally friendly design.

Adoption of green procurement items (construction design)

2 Green Purchasing Law: Law Concerning the Promotion of Procurement of Eco-Friendly Goods and Services by the State and Other Entities

Conservation of Biodiversity

ISO 6.5.6 Protection of the environment, biodiversity and restoration of natural habitats

Biodiversity Conservation Technology

Tablet using Ikimono Concierge®

Ikimono Concierge®
Ikimono (living creatures) Concierge is a computer application for biodiversity-friendly facility planning. The effect of creating green areas and watersides that take biodiversity into consideration, which is generally not very visible, can be quantitatively assessed by estimating and visualizing the possibility of visits by creatures
such as birds, butterflies, and dragonflies. Optimal facility planning is made possible by systematically adopting the perspective of biodiversity from the early stage of facility planning.
Clear results appear quickly by inputting the green area conditions of the planning zone using a tablet PC while having discussions with the client, which permits the easy application of case studies on green and water planning for parks and buildings.
This tool received the 2015 Good Design Award and the Chairperson's Award (Award of Excellence) of the Eco-Products Awards Steering Committee for providing a new approach to biodiversity and contributing to the promotion of biodiversity conservation in society.
We are actively implementing a variety of projects to create a society with rich biodiversity.

Environmental Education and Activities

Tokyo Greenship Action

Making dormouse nest boxes

Since 2007, Taisei Corporation has been participating in Tokyo Greenship Action, which is organized by the Tokyo Metropolitan Government. Twice each year, employees of Taisei and its group companies and their families participate in volunteer activities to protect rural communities. Such activities are also included in new employee training, in which they learn and better understand the environment and rural communities through nature observation, thinning activities, etc. In addition, as part of our volunteer activities, we make dormouse nest boxes every year and promote the construction of animal pathways in cooperation with NPO to maintain the passage of dormice on roads when they move through the forests.
Further, we are making a variety of efforts, including seminars on the environment given by outside experts in future biodiversity offset management and e-learning on the environment undertaken for all officers and employees, to provide our employees with a better understanding of the importance of the connection of the construction business and social life with the natural environment.


Giveaways with the design of Taisei Corporation's mascot "Anzen Boya" (safety boy)

TAISEI 1ton CLUB, which commenced in 2010 with the blanket purchase activity of CO2 emission rights by individual employees, has continued in various forms as environmental contribution activities led by volunteer employees. In FY2015, the club promoted the purchase of CO2 absorption credits available from one coin (500 yen) for disaster recovery and forest preservation in the Tohoku Region. The participants were given exclusive giveaways made of thinned wood from this forest, processed and created at a studio in Minamisanriku Town. With the support of the entire Taisei Corporation Group, the club purchased a credit for 45t-CO2 of the forests operated by the Kamaishi Forest Owner's Association.

Reduction of Environmental Risk

ISO 6.5.3 Prevention of pollution

Risk Management at Construction Sites and Offices

Proportion of site environmental patrol observation items (FY 2015)

"Other" includes Soil Contamination Countermeasures, Local Regulations, and Water Pollution Control, and no issues concerning Noise/Vibration Regulation were identified.

Site Environmental Patrols are implemented to survey compliance with environmental laws and regulations on construction sites throughout the company. Corrective actions and preventative measures are taken in response to observations in order to achieve continuous improvement.
We also provide our employees and sub contractors with environmental education to help them understand the importance of environmental management and prevent environment-related accidents while raising awareness of the proper management of harmful chemicals such as asbestos and PCBs and to achieve the appropriate management and processing of contaminated soil, etc.
In FY2015, no accidents or legal violations related to the environment occurred.

Complaints on Construction Sites and Responses Taken

Proportion of complaint types and examples of responses (FY 2015)

Types Response measures (examples)
Noise In response to complaints about the noise of dump trucks transporting surplus soil at midnight, an area away from houses was rented in which to keep surplus soil.
Vibrations In response to complaints about vibrations made by regular vehicles passing over the road surface lining, cushioning materials were placed underneath the lining to reduce gaps, and the pavement was repaired.
Dust In response to complaints about the dust from the cutting of the concrete ditch of the exterior, water was sprayed during the operation to prevent the dust from flying around.
Traffic obstruction In response to complaints about traffic jams during traffic control, the traffic guides were re-trained for the signs and calls to give, and the locations of the traffic guides and information boards were improved.
Radiowave interference In response to complaints about the interference of radio waves used by the sub contractors with television waves, the use of radio waves was prohibited at the construction sites.

Taisei Corporation takes the appropriate measures regarding complaints related to the environment reported to its construction sites, etc., and maintains records and reports using communication sheets based on the EMS procedures and communicates across the relevant departments and the Company when necessary.
Recently, more opinions have been provided by citizen groups, to which we strive to respond appropriately.


Proper Management of Construction Waste

  • Environment Division

Taisei Corporation has been promoting the use of the electronic manifest (waste transmittal forms) in cooperation with outsourcing companies for waste processing, collection and transport companies, and waste disposal companies in order to achieve the proper processing of construction waste. As a result, its use in major cities such as the metropolitan area is virtually 100%. While there are some cases where the electronic manifest system cannot be introduced due to the conditions of the construction site or customer or the scale of the companies, we are continuing to make efforts to increase this percentage.

Rate of Using Electronic Manifest at Construction Sites ・・・93.9%

Comprehensive Activities for the Environment

ISO 6.5 Environment

Eco Model Project

Of all the construction sites striving for CO2 Zero Action, Taisei Corporation selects those working to reduce the environmental impact at a particularly advanced construction stage as an Eco Model Project to further implement CO2 reduction activities, etc.
This project was extended to the overseas construction sites in FY2014, and from its commencement in 2002, a total of 139 sites had implemented the project by March 2016.
As part of the project, we have also been working for the effective use of resources such as the 3R*, and we contribute to CO2 reduction through the sorting and volume reduction of 100 types of waste materials.

3R: Reduce / Reuse / Recycle


Providing Environmentally Friendly Technologies

  • Environment Division

In FY2015, we published 39 media announcements on our technologies and systems related to the smart community and ZEB, the development of materials such as environmentally friendly concrete for low carbon and the effective use of resources, technologies for biodiversity presentation tools and contaminated soil purification, water quality preservation systems, and projects for applying such technologies.

Number of Media Announcements Regarding Environment Related Technology Development ・・・39projects