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Carbon dioxide in the atmosphere may get the lion’s share of attention in climate change discussions, but the biggest repository of carbon is actually underfoot: soils store an estimated 2.5 trillion tons of carbon in the form of organic matter.
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On Tuesday, Feb. 18, President Obama unveiled the timing for the next phase of fuel economy regulations for trucks. He delivered his speech at a Safeway store in Maryland.

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Former Energy Secretary Steven Chu mixed his Wigner Distinguished Lecture on Feb . 12 with a description of his current research at Stanford and his outlook on energy policy and climate change.
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After an illustrious 36-year career, energy policy research analyst David Greene retired late last year from The Department of Energy's Oak Ridge National Laboratory.