Energy change is key to meeting UN climate goal: panel The world can still meet the UN goal to limit global warming provided it cuts annual greenhouse gas emissions by 40-70 percent by 2050, a top expert panel said Sunday. The Intergovernmental Panel on Climate Change (IPCC) warned starkly that on present trends the planet would be 3.7-4.8 C warmer by 2100 -- a level many scientists say could be catastrophic. Images and soundbites of the final press conference.