Until now, energy savings in air-conditioning and lighting systems have been carried out through mainstream global warming measures in houses. Now, however, progress has been made into the research of the water-saving performance of home fittings such as toilets and showers, along with reductions in the CO_2 emissions associated with these devices. As a result, water saving has now been recognized as a method for combating global warming, and CO_2 emission reduction by spreading the use of water-saving devices has been adopted by Japan's domestic carbon credit system as a way of achieving CO_2 emission reduction targets. However, in the method adopted, the burden of measurement is heavy and it is difficult to generalize carbon credit projects. To expand the popularity of carbon credit projects, the method, including the establishment of approaches to replace de facto values with measurements, needs to be revised. The credit system that has been adopted, together with views on the future of the system, is outlined in this paper.
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