Reuters: The United Nations urged rich nations on Tuesday to keep a pledge to give $30 billion to poor nations by 2012 to cope with climate change, saying it was “not an impossible call” despite budget cuts in Europe. Yvo de Boer, head of the U.N. Climate Change Secretariat, also said it was extremely unlikely that a new U.N. climate treaty would be agreed in 2010 after the Copenhagen summit in December fell short of a full, legally binding treaty. He said that one priority for 2010 was …