McKitrick notes that Mann, a lead author, had available to him two studies besides his own presenting hemispheric temperature histories dating back to the Medieval Era.

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They would move around on their own at room temperature.

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It has long been known that some solid materials, called metal hydrides, are capable of storing small amounts (about 1-2% of their own weight) of hydrogen at room temperature.

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The materials inside these fuel cells are touchy about changes in temperature and humidity and prone to their own form of carbon monoxide poisoning.

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If I didn't want to build my own cellar, Mr. Ziskind noted that he also owns a temperature-controlled warehouse with a few partners.

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Scientists say the temperature increase, in turn, is causing Atlanta to produce its own weather.

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Altering the balance of energy has created what Bornstein calls "urban heat islands" where the temperature is 5 to 10 degrees hotter than outlying areas and generate their own rain.

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"These initial findings are very encouraging and echo our own results and our conclusion that the impact of urban heat islands on the overall global temperature is minimal, " Jones said in a statement.

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To compare alien planets, Dr. Mendez at the Planetary Habitability Laboratory and his colleagues are creating an Earth Similarity Index that ranks worlds by their resemblance to our own planet, on a scale from zero to one, based on their mass, radius, density and surface temperature.

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