On average, global temperatures in 2011 were lower than the record level hit the previous year but were still 0.40 degrees Centigrade above the 1961-1990 average, the report said.
"The world is warming because of human activities and this is resulting in far-reaching and potentially irreversible impact on our Earth, atmosphere and oceans," said WMO Secretary-General Michel Jarraud.
La Nina, a natural weather phenomenon linked to heavy rains and flooding in Asia-Pacific and South America and drought in Africa, was active in the tropical Pacific until last May.
Copyright @ Thomson Reuters 2012
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