NUSA DUA, Indonesia, Dec 10 (Reuters) - U.N. climate talks in Bali dropped a tough 2020 target on Monday for rich nations to cut greenhouse gases after opposition led by the United States, a delegate said.

The latest draft of an accord for the 190-nation Dec. 3-14 meeting, which is seeking to launch two years of negotiations on a new pact to slow global warming, dropped a goal of cuts in emissions of 25-40 percent below 1990 levels by 2020.

"The numbers are out of the latest text," one delegate said, adding that the United States had led opposition along with countries including Japan and Canada. The 2020 goal for rich nations had been in the draft proposal on Saturday.

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(Editing by David Fogarty)

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