(Reuters) - Investors are downbeat about prospects for a global carbon market as uncertainty over policy continues, a survey showed on Wednesday.

Hopes for an emissions trading scheme in the United States by 2015 have dimmed, with 61 percent of respondents confident this will happen, compared with 81 percent last year, the survey by Point Carbon showed. Respondents expect a lower global carbon price of 31 euros ($41.92) a tonne in 2020, down from 35 euros in last year's survey.

"Failure to get a deal at the Copenhagen COP in December and the Obama administration's failure to land a U.S. cap-and-trade programme may have knocked the momentum in carbon markets," said Kjetil Roine, author of the report.

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