WASHINGTON, Sept. 23 — Dozens of world leaders are to gather at the United Nations on Monday for a full agenda of talks on how to fight global warming, and President Bush is skipping all the day’s events but the dinner.

His focus instead is on his own gathering of leaders in Washington later this week, a meeting with the same stated goal, a reduction in the emissions blamed for climate change, but a fundamentally different idea of how to achieve it.

Mr. Bush’s aides say that the parallel meeting does not compete against the United Nations’ process — hijacking it, as his critics charge. They say that Mr. Bush hopes to persuade the nations that produce 90 percent of the world’s emissions to come to a consensus that would allow each, including the United States, to set its own policies rather than having limits imposed by binding international treaty.

“It’s our philosophy that each nation has the sovereign capacity to decide for itself what its own portfolio of policies should be,” said James L. Connaughton, the president’s chief environmental adviser.