FACTBOX - What's left to agree in U.N. climate talks

REUTERS - More than 190 nations will meet in Copenhagen on Dec. 7-18 aiming to agree a new U.N. climate pact. Following are faultlines still to be overcome:

GREENHOUSE GAS EMISSIONS

CUTS BY RICH NATIONS

2020 - Developing nations such as China and India want the rich to cut their greenhouse gas emissions by at least 40 percent below 1990 levels by 2020. Offers on the table so far average between 11 and 15 percent. The United Nations wants firm 2020 offers from every developed country in Copenhagen, including the United States.

2050 - Rich nations including the Group of Eight favour agreeing a global goal of halving world greenhouse gas emissions by 2050. Some developing nations including China and India have rejected such a target, unless the rich lay out far deeper mid-term cuts.

TEMPERATURES