Protecting the precious environment
Construction: Initiatives to prevent global warming

#Energy & CO2

CO2 emissions

In order to reduce CO2 emissions in the construction stage, we are rigidly enforcing the prevention of vehicle idling and appropriate maintenance of construction machinery and vehicles, etc. at each construction site.

CO2 emissions per unit of net sales in fiscal 2018 totaled 10.21t-CO2/hundred million yen, an increase of 0.32t-CO2/hundred million yen (3%) compared to fiscal 2017.

Trends in CO₂ emissions

CO2 emissions
#Energy & CO2#Pollution prevention and the local environment

Reducing CO2 based on industrial waste disposal contractor designation system

Industrial waste generated at construction sites are separated by item (e.g., wood waste, waste plastics, mixed waste) and disposed of by designated companies. Among them, mixed waste has been substantially reduced but are generated over a long period of time from commencement of construction to completion at the site.

From among 6 designated companies and 12 plants in the Tokyo region and 6 designated companies and 8 plants in the Kansai region, we select a disposal contractor that is close to the site and thereby reduce the waste transportation distance, which translates into improved waste collection and transportation efficiency as well as lower CO2emissions.

#Energy & CO2#Pollution prevention and the local environment

Reducing CO2 through effective on-site use of soil generated from construction

Nearly approx. 90% of CO2 emissions generated at construction sites is attributable to the use of light oil, so the usage of light oil substantially affects the reduction of CO2 emissions.

In recent years, soil landfill sites have become further away, so CO2 emissions generated during soil transportation tend to increase.

At construction sites, we use the soil generated from excavating works as backfill soil on the site to the greatest extent possible in an effort to reduce the number of dump trucks carrying the soil outside the site and thus reduce CO2 emissions.

Most of the surplus construction soil carried outside the construction site is disposed of in the form of landfill, which may cause the destruction of forests. Reducing the transportation volume of surplus soil will also help protect forests.

Measures to prevent soil from being scattered and blown off
Reuse of temporarily placed soils within the construction site as backfill soils around basic building frames
#Energy & CO2

Identifying CO2 emissions in large-scale repair work

As shown in the following table, Haseko Reform, Inc. measured CO2 emissions at large-scale repair worksites, which revealed that total CO2 emissions increased 12% year-on-year to 145.98t at 113 sites where works were completed for contracts worth 50 million yen or more (63 sites in Tokyo and 50 sites in Kansai).

Meanwhile, CO2 emissions increased in terms of emissions per unit of net sales, growing 11% year-on-year to 0.83t-CO2, due in part to the impact of the increase in properties amounting to no more than 50 million yen and the increase in properties subject to large-scale repair works, in addition to electricity usage, light oil usage, etc. in super high-rise condominiums, mast climbing work platforms, etc. slightly increasing compared to 2017 levels.

Identifying CO2 emissions (Contract amount is the total amount of the relevant site's portion)

Company-wide FY2014
(123 sites)		 FY2015
(116 sites)		 FY2016
(124 sites)		 FY2017
(100 sites)		 FY2018
(113 sites)
Total CO2 emissions Total CO2 emissions Total CO2 emissions Total CO2 emissions Total CO2 emissions
Electricity usage 165,116kWh 57.15t-CO2 273,834
kWh		 91.89t-CO2 371,488
kWh		 128.38t-CO2 227,736
kWh		 84.49t-CO2 223,977
kWh		 118.29t-CO2
Light oil usage 22,890ℓ 68.75t-CO2 19,121ℓ 50.56t-CO2 47,007ℓ 124.3t-CO2 17,246ℓ 45.6t-CO2 18,295ℓ 27.69t-CO2
Waste discharged 2,354t - 2,759t - 1,889t - 2,020t - 1,378t -
Total CO2 - 125.90t-CO2 - 142.45t-CO2 - 252.68t-CO2 - 130.09t-CO2 - 145.98t-CO2
Contract amount \22,547 million \19,500 million \19,116 million \17,128 million \17,650 million
CO2 emissions per unit of net sales 0.55t-CO2/hundred million yen 0.73t-CO2/hundred million yen 1.32t-CO2/hundred million yen 0.75t-CO2/hundred million yen 0.83t-CO2/hundred million yen