Greenhouse Gas

HOYA Strategy for CO2 Reduction

The HOYA Group is globally conducting its environmental protection activities, in which attempts are being made to reduce CO2 emissions by paying special attention to its “energy consumption.”

CO2 Reduction Targets

In order to accelerate initiatives to reduce greenhouse gas (CO2) emissions, we have started conducting studies and holding discussions internally on the medium- and long-term targets and roadmaps for the HOYA Group. For fiscal 2022, we are implementing measures tentatively targeted at reducing annual emissions by 1% (compared to fiscal 2019 level) until our medium- and long-term targets are set.

CO2 Emissions

HOYA has conducted third-party verification of the greenhouse gas (GHG) emissions data for fiscal 2021 for the first time. During the verification process, we reviewed the calculation method and CO2 conversion factors, and recalculated the GHG data (Scope 1 and 2). As a result, the CO2 emissions (Scope 1+2) for fiscal 2021 were revised from 426 thousand tons to 522 thousand tons in February 2023. Before fiscal 2021, the figures based on the previous calculation method remain unchanged, but from fiscal 2021 onwards, we will continue to use the calculation method after revising the CO2 conversion factors.


K t-CO2e Unit 2014 2015 2016 2017 2018 2019 2020 2021
Scope 1 emissions K t-CO2 27 23 21 21 22 21 16 16
Scope 2 emissions K t-CO2 373 394 377 388 383 398 390 506
Total K t-CO2 401 417 398 409 406 418 406 522
CO2 emissions per unit of net sales t-CO2 per
billion yen
818 826 831 764 717 726 741 789

● Scope of data collection: Major overseas production sites, domestic production and non-production sites
● Reference guidelines: GHG Emissions Calculation and Reporting Manual Ver. 4.8 and GHG Protocol
● CO2 emission factors *Including some non-production sites
–  Fuel: for outside of Japan – DEFRA Conversion-Factor, for Japan – the list of emissions and calculation methods published by Ministry of the Environment.
–  Electricity: for outside of Japan – IEA Emission Factors for each country, for Japan – adjusted conversion factors of the individual electricity supplier contracted by each site based on the Act on Promotion of Global Warming Countermeasures
● The data shown in the “HOYA Integrated Report 2022” are the figures before the correction due to the implementation of the third-party verification, and will be corrected when the Integrated Report for the next fiscal year is issued.


Third-Party Verification of Greenhouse Gas (GHG) Emissions

To improve the reliability of our calculations, we have undergone third-party verification of our fiscal 2021 GHG emissions (Scope 1 and 2, energy consumption) data at a limited level of assurance.


Response to the TCFD

In November 2021, HOYA declared its support for the recommendations by the Task Force on Climate-related Financial Disclosures (TCFD). In April 2023, we made our first climate change-related disclosure based on TCFD recommendations.


Energy saving and power saving activities

At production bases, we are replacing facilities with energy-saving types (such as adopting ice thermal storage systems and high-efficiency transformers), conducting energy-saving activities (such as optimizing the operating hours of boilers and air-conditioning equipment) and promoting roof-greening, etc. We are also endeavoring to suppress CO2 emissions from non-production bases by such means as introducing casual wear, adjusting the indoor temperature appropriately and implementing efficient lighting in offices.


Examples of energy and power saving initiatives

● Use of the Joint Crediting Mechanism (JCM)

● In 2016, we introduced a heat recovery heat pump at the eyeglass lens plant in Vietnam. It is used to save energy and reduce CO2 emissions by using the heat that used to be expelled to the outside air when cold heat was supplied as a source of cold heat for the production process and as an auxiliary heat source for heating the water used in the manufacturing process. Before introducing the heat recovery heat pump, we used only electric heaters to obtain the desired temperature.


● At the eyeglass lens plant in Vietnam, one of the existing centrifugal chillers was replaced with a highly efficient inverter centrifugal chiller. By using the new chiller for regular operation and the old one as backup equipment, we achieved a lower introduction cost, improved energy efficiency, and reduced CO2 emissions at the same time.

● Introduction of renewable energy
Some of our business establishments engaged in the eyeglass lens business—namely, HOYA Vision Care ATC Ramsey in the United States and HOYA LENS DEUTSCHLAND GMBH in Europe—are running on 100% renewable energy. We will continue to promote the introduction of renewable energy on a Group-wide scale.

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