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How increased evaporation over land and sea - the hydrological cycle - will mean that there is increased rainfall in some places and less rain in others.

The effect is caused by global warming. Journalist Fred Pearce discusses why these changes will most affect the developing world.

Also on the programme how climate change is affecting species on islands such as Hong Kong, Bermuda and South Georgia.

Presenter: Jill Neville. Producer: Stephen Hedges.