Atmosphere’s CO2 Burden Reaches 3,000,000-Year High (NYT)

Could Mark Sanford Lead Republicans Out of Climate-Denial Wilderness? (Bill Becker, Climate Progress)

The Cost of Doing Nothing (Sarah Kellogg, Washington Lawyer)

Graph: How “Skeptics” View Global Warming (skepticalscience.com)

Extended Drought Gets Texans Thinking Conservation (NYT)

James Hansen Will Retire from NASA, Step Up Climate Fight (NYT)

Global Warming in 7 Charts (Brad Plumer, WaPo)

Global Temperatures Highest in 4,000 Years (NYT)

2012 Saw Second-Largest Ever Rise in Atmospheric CO2 (HuffPo Green)

In Defense of Dr. Hansen & Other Climate Hawks (Bill McKibben, Grist)