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Historical events linked to changes in Earth’s temperature

Ozone treaty, wars and Great Depression influenced global warming rate, scientists find

SHRINKING HOLE  The ozone hole over Antarctica reached its largest extent in 2006 (purple and blue indicate depleted ozone) before starting to shrink. The international treaty intended to reduce the ozone hole has had a cooling effect on Earth’s climate, a study finds.

The Great Depression, World Wars I and II and an international treaty restricting ozone-depleting chemicals each had measurable effects on global temperatures, scientists report November 10 in Nature Geoscience. This finding represents one of the first times scientists have linked specific economic and political events to observed changes in how fast global temperatures are rising.

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