Japan plans smart meters in every residence and factory by the early 2020s and 5.3 million fuel cells in homes by 2030 to tackle climate change, according to a report to be submitted to the United Nations.The country will also promote renewable energy as much as possible over the next three years, the Japanese government said in the biennial report, which developed countries are asked to submit byJanuary 1. Nuclear reactors will be restarted after safety is confirmed and thermal power generation efficiency will be enhanced, the government said. Click here to know more