Independent (UK): World’s number two polluter says it will offer to cut emissions by 17 percent from 2005 levels by 2020, deepening to 30 percent by 2025, 42 percent by 2030 and 83 percent by 2050. The offer “is in the context of an overall deal in Copenhagen that includes robust mitigation contributions from China and the other emerging economies.” The US target for 2020 means only a fall of four percentage points compared to 1990, the benchmark year widely used as the interim target in the UN …