About 190 nations met on Monday under pressure to sharpen the fight against climate change by involving outsiders such as the United States to China in a long-term U.N.-led pact.

After a year of intense climate diplomacy, about 10,000 delegates at the U.N. talks in Bali, Indonesia, met to try to start negotiations on a "roadmap" that will lead to a broad U.N. pact by late 2009 to tackle greenhouse gas emissions.