The plasma sparks around the window as the temperature rises to 3, 000 degrees Fahrenheit.

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It suggests that the impact on human health, the availability of food and water, the loss of coastlines becomes progressively worse as the average temperature of the planet rises.

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And that kind of panic becomes more likely as the imbalances grow and the political temperature rises.

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"In Antarctica, as the air temperature warms up, the humidity rises and the ability of snowfall to occur increases, " McClintock said.

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There is no air conditioning to offer relief, even as the temperature inside Anhembi Exhibit Hall rises above 80 degrees well before noon.

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That output is known to vary during the course of the 11-year sunspot cycle, as well as over the longer term, and although such changes have not been matched to temperature changes in the way that rises in the level of greenhouse gases have been, they may still be making a contribution.

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