Photo: Small Increases in Warming Could Wreak Worldwide Havoc, Scientists Warn

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Little light penetrates the Brazilian rain forest's canopy—its overhead cover of leaves and branches.

In a new report, scientists warn that global warming of more than 5.5°F (3°C) will greatly increase the risk of worldwide floods, droughts, and fires, including dry spells and blazes that would transform the Amazon rain forest into grassland.

Photograph by Otis Imboden/NGS

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