Two Thousand Years Ago, a New Ice Age Began—but Human-Caused Climate Change Recently Reversed It, According to New Research

All that's left of a gargantuan ice sheet that once covered nearly 30 percent of North America is a Delaware-size ice cap in Canada. Scientists have found that the ice cap began to expand around 2,000 years ago—a sign of a new ice age—but it started shrinking in the 1960s

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