Reuters: The world will be unable to agree a full deal in 2010 to fight global warming, the U.N.’s top climate official said Sunday, as 175 nations struggled to revive talks after the antagonistic Copenhagen summit. Yvo de Boer said governments should focus on practical steps in 2010, such as aid to help poor nations cope with the impacts of climate change or to promote clean technologies, after Copenhagen fell short of a full, over-arching treaty. Many delegates at the April 9-11 Bonn …