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The “hockey stick” graph featured in the 2001 IPCC assessment, showing temperature (departures from the 1961–1990 average) in the Northern Hemisphere during the past 1000 years. (IPCC)
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Dutch painter Hendrick Avercamp (1585–1634) was a specialist in winter scenes, especially skaters on frozen rivers, canals, and flood waters. (Hendrick Avercamp [public domain], via Wikimedia Commons)
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Scientists take ice core samples in cold, windy, and forbidding environments. (Ted Scambos and Rob Bauer, U.S. National Snow and Ice Data Center)
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- James Lovelock. (Bruno Comby/Wikimedia Commons)
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The Indian subcontinent about to crash into Asia 60 million years ago.
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The process involved in undersea volcanism and the surface and atmospheric effects.
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An ancient bristlecone pine from the White Mountains of California. (Gnarly/Wikimedia Commons)
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Mount Pinatubo erupts on June 12, 1991. (U.S. Geological Survey/Cascades Volcano Observatory)
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The Earth, circa 250 million years ago, showing the supercontinent Pangaea.
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James Croll. (J.C. Irons/photo courtesy NOAA)