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Action on warming is imperative

Today, international action on climate change is urgent and essential. Indeed, there can no longer be any debate about the need to act, because the Intergovernmental Panel on Climate Change (IPCC), of which I am chairman, has established climate change as an unequivocal reality beyond scientific doubt.

For instance, changes are taking place in precipitation patterns, with a trend toward higher precipitation levels in the world's upper latitudes and lower precipitation in some subtropical and tropical regions, as well as in the Mediterranean area.

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