"How can you possibly have an international agreement that's effective unless countries like China and India are not full participants," Bush said.
The issue of climate change came up during his meeting with visiting South Korean President Lee Myung-Bak at Camp David.
"And that's why I assured him (Lee) this major economies meeting that is taking place in Paris. I assured him ... that hopefully by the time we get to G8 there's a serious effort by all major economies to become active participants in a effective strategy to deal with this issue," Bush said at a joint press conference with Lee.
Bush said they discussed the issue and agreed to take a rational approach on it.
"We talked about our mutual desire to have a rational, practical approach to the international climate issue, global warming," Bush said.
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