Climate change will affect urban workers the most, according to a study modelling the effects of climate change in 16 developing countries. The survey examined the potential economic influence of adverse climate events, such as heat waves, drought and heavy rains, on seven socioeconomic groups.

About 180 nations met for U.N. climate talks on Monday amid warnings that time was running out for them to reach agreement on a hugely complex pact, due for completion at the end of the year.

Aid of $10 billion from rich nations would be a "good beginning" to launch a U.N. climate treaty due to be agreed in Copenhagen in December, the United Nations' top climate official said on Thursday.