Climate experts say information for the first ten years of the twenty-first century will probably show it to be the warmest ten-year period ever measured. The World Meteorological Organization released the findings on the second day of a climate conference in Copenhagen. The head of the organization, Michel Jarraud, spoke to representatives of one hundred ninety-two nations. He said the final temperature will be released early next year. He said this year will probably be the fifth warmest since scientists began keeping world climate records in eighteen fifty. Environmentalists and activists have criticized an early version of a climate change deal that conference officials are trying to create. They say the deal strongly favors rich countries over the concerns of developing nations.