Reuters: Governments broadly support tough 2050 goals for cuts in greenhouse gas emissions but are split on how to share out the reductions, according to a new guide to negotiators of a new United Nations climate pact. A document, which was put together late year and is to be presented to UN climate talks in Bonn from March 29 to April 8, narrows down a list of ideas for fighting global warming in a new treaty due to be agreed in December to about 30 pages from 120. “It shows that …