No global climate change pact could be fruitful without including India and China, US president George Bush said on Sunday as leaders from G8 nations prepared to thrash out a long-term deal to face global warming. "I'll be constructive,' Bush said after talks with Japanese premier Yasuo Fukuda, but "we're not going to solve the problem' unless those two fast-growing economies take part in any long-term deal,' Japanese media reported. Bush, who is on a visit to Japan to attend G8 summit that begins on Monday in Hokkaido, will meet world's top leaders including prime minister Manmohan Singh on the sidelines of the summit. The president said he was "realistic enough to tell you that if China and India don't share that same aspiration, that we're not going to solve the problem.' Japan has made climate change a key topic at the meeting, and many hope G8 will give some indication of its commitment to cutting greenhouse gases to move forward UN-led talks aimed at replacing the Kyoto Protocol on climate change, which expires in 2012. The summit includes meetings between the G8 and the G5 that includes major developing nations