Climate change may have reached the point of no return last month.
CO2 levels in the atmosphere topped 400 parts per million on May 19, for the first time since the Pleistocene era, over 2.5 million years ago. President Barack Obama’s historic speech on climate change today highlights his growing focus on this issue for his second term.
Climate scientists have long regarded that 400 number as the symbolic threshold. One step beyond, and it would be virtually impossible to put the brake on human-generated climate change. The bad news escalated last week when the International Energy Agency reported that global emissions of carbon dioxide rose 1.4 percent in 2012, the largest annual increase on record.




The U.S. Supreme Court, in a 5-4 vote Tuesday, struck down a core provision of the Voting Rights Act that singles out part of the country for special treatment.
Elevated levels of methane and other stray gases have been found in drinking water near natural gas wells in Pennsylvania's gas-rich Marcellus shale region, according to new research. In the case of methane, concentrations were six times higher in some drinking water found within one kilometer of drilling operations.
Every June a few US supreme court cases get a reputation for being blockbusters, and this year has been no different. We're still awaiting decisions on cases concerning gay marriage and the Voting Rights Act. But the blockbusters can obscure smaller cases with profound effects. On Monday, the court quietly delivered a destructive, toxic decision on workplace harassment that is as significant as anything else this year.
Rep. Darrell Issa made nearly $60 million in 2012, according to a financial disclosure he filed with the House earlier this month.
After the Sept. 11, 2001, terror attacks, a million former U.S. smokers took up the habit again and kept puffing for at least two years, a researcher says.





























