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Melting ice caps are the canaries in the coal mines for the probable and impending global climate catastrophe. Arctic ice sheets endured record-breaking melt this summer with the annual thaw of the region’s floating ice reaching the lowest level since satellite monitoring began more than 30 years ago.

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Global warming is happening and “humans are almost entirely the cause.” That’s the conclusion reached by a team of researchers at UC Berkeley, led by professor Richard Muller, who now considers himself a “converted skeptic” on the issue.

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