Japan should promote nuclear power and renewable energy sources to replace fossil fuels to fight global warming, a Canadian scientist said Wednesday.

Although Japan has tried more sincerely than other developed countries to achieve its greenhouse gas emission cuts under the Kyoto Protocol, its efforts won't be effective enough to reach the goal, according to Patrick Moore, chairman and chief scientist of Greenspirit Strategies, a Canadian environment consultancy.

"The only solution I can see . . . is aggressive combination of renewable and nuclear energy," Moore told reporters Wednesday in Tokyo.