Harsh weather causes trouble in many countries

Is the earth in a miniature Ice Age?

Climate change threatens to starve penguins

UN climate summit stops short of endorsement

Chinese Premier Wen make 4 proposals at climate meeting

World leaders reach deal on climate change

Founding comes with strings attached

UN chief remains optimistic about climate deal

Premier Wen: China's climate commitments unconditional

Wen express hope for fair, reasonable results from Copenhagen

March held as lights dim in Copenhagen

Developing countries protest draft texts

NASA releases new black carbon video

UN chief urges countries to stop playing 'blame game'

Africa seeks to extend Kyoto Protocol

Negotiations continue in Copenhagen