The Japanese government will contribute up to $100 million to two new funds to be set up together with the Asian Development Bank to promote clean energy and improve the investment climate in Asia, he told the opening session of the ADB's annual meeting in Kyoto, western Japan.

Omi also said Japan would provide loans of up to $2 billion over the next five years through the government-affiliated Japan Bank for International Cooperation to promote investment and address the issue of climate change.

"I expect this initiative will help ensure sustainable economic development in the region," he said.

Omi said the Kyoto Protocol covers only 30 percent of total current CO2 emissions worldwide, and that ratio is expected to fall as emissions from developing countries increase.

The ADB said on Friday it would spend at least $1 billion on clean energy projects in 2008, as it seeks to strengthen its role in balancing economic development and environmental concerns in the region.

That would mark a rise of 10 percent or more from this year, when it is expected to invest $900 million in such projects.

Omi, who was formerly a minister in charge of science and technology, also said the ADB should place more emphasis on these fields, saying this would be "a new wing" to the agency in helping developing countries in the region.

"I believe it may be worthwhile to direct a portion of ODA (official development assistance) to cooperation in research activities and capacity building in the science and technology area," he said.