The report confirmed scientific observations that the concentration of greenhouse gases in the atmosphere is growing, not shrinking. On Tuesday the World Meteorological Organization reported that the amount of greenhouse gases in the atmosphere reached a record high last year.
Climate activists said the reports underscored the urgency in advancing clean technologies, such as wind and solar power.
"The only way we are going achieve the necessary cuts in emissions is to move away from fossil fuels and towards a world of renewable energy," said Kaisa Kosonen, climate policy adviser at Greenpeace.
The Kyoto Protocol, the only international agreement to reduce the emissions of greenhouse gases from industrial countries, expires this year. Talks in Doha will focus on extending it for another term while negotiators work on a more comprehensive climate pact that would also include developing countries, whose share of global emissions is growing.
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