The Copenhagen climate summit's search for a deal to curb the world's greenhouse gas emissions won't succeed unless there is agreement on another thing too - money.
Many of the countries which are most at risk from climate change are poor.
They say they can't afford to switch to cleaner energy generation or to defend their populations from problems such as drought and the rising sea level without help from rich countries.
Industrialised countries - which are historically responsible for emitting greenhouse gases - agreed to help such nations when they signed up to the UN climate change convention (UNFCCC).
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