Article: UN chief says global warming may cost up to $20 trillion over 2 decades

Global warming could cost the world up to $20 trillion (13.5 trillion) over two decades for cleaner energy sources and do the most harm to people who can least afford to adapt, U.N. Secretary-General Ban Ki-moon warns in a new report.

Ban's report obtained by The Associated Press provides an overview of U.N. climate efforts to help the 192-nation General Assembly prepare for a key two-day climate debate in mid-February. That debate is intended to shape overall U.N. policy on climate change, including how nations can adapt to a warmer world and ways of supporting the U.N.-led negotiations toward a new climate treaty by 2009.

The treaty, replacing the Kyoto Protocol when it ...

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