After a meeting of top officials including Prime Minister Yasuo Fukuda, Japan's top government spokesman said current plans to fight global warming would be revised, with new steps to be mapped out for sectors such as households and industry.

"It is looking very difficult to reach the Kyoto Protocol's 6 percent reduction target based solely on the plans already in place," Chief Cabinet Secretary Nobutaka Machimura told a news conference.

Japan's emissions were 14 percent above the Kyoto goal as of March 2006. An advisory panel forecast in August that emissions would continue to rise over the next few years.

Of particular concern are emissions from households and offices, although the government has been trying to raise public consciousness to cut back on energy use.