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A dubious achievement for humanity

A dubious achievement for humanity

Earlier this year, scientists at the NOAA Mauna Loa Observatory in Hawaii announced a major threshold in the Earth system had been crossed: the concentration of the greenhouse gas carbon dioxide in Earth’s atmosphere has now passed a level not seen in the last 3 million years.

September 29, 2013 12:00 am Photos

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Guest Column: How would an extra month of 100-plus-degree days feel?

Guest Column: How would an extra month of 100-plus-degree days feel?

Climate change is not just happening in some far and distant place. It's happening now, right here in Arizona.

May 01, 2013 12:00 amLoading…

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