Japan and the United States are considering convening separate international environmental meetings on water and energy problems in the leadup to the World Summit on Sustainable Development, government sources said Friday.

The sources said the meetings will be held in the summer either in Japan or in the U.S., although details, such as specific dates and venues, have yet to be worked out.

In addition to the meetings on water and energy problems, the two countries plan to jointly launch a still-undetermined project on health care in developing countries, also during the summer, the sources said.