The Pliocene called. It wants its CO2 levels back.
May 8, 2015, 11:24 a.m. by Russell McLendon
Earth just averaged 400 parts per million of carbon dioxide for a month, which hasn't happened in human history — and possibly not since the Pliocene Epoch about 3 million years ago.
Michael Bloomberg gifts Sierra Club $30M to fund anti-coal efforts
April 8, 2015, 11:28 a.m. by Michael d'Estries
Billionaire philanthropist and former mayor says he's 'doubling down' on efforts to reduce carbon emissions and to replace half the nation's coal with clean energy by 2017.
Greenhouse effect is observed and getting worse
February 26, 2015, 3:27 p.m. by Becky Oskin, LiveScience
Researchers used powerful spectrometers to monitor and track how much infrared radiation was being trapped inside the Earth's atmosphere.
Did ocean's big CO2 burps end last ice age?
February 12, 2015, 10:56 a.m. by Becky Oskin, LiveScience
Scientists are not sure what caused these releases of carbon dioxide, with theories ranging from changes in ocean currents to more active underwater volcanoes.