Agence France-Presse: Evidence for global warming has mounted but public awareness of the threat has shrunk, due to a cold northern winter and finger-pointing at the UN’s climate experts, a top scientist warned Wednesday. James Hansen, a leading NASA scientist whose testimony to the US Congress in 1988 was a landmark in the history of climate change, said he was worried by “the large gap” in knowledge between specialists and the public, including politicians. “That gap has increased substantially in …