"Hedge fund manager turned environmentalist Tom Steyer is challenging fellow billionaires, Charles and Davide Koch, to a debate on the Keystone XL pipeline."

"Automakers on average have reduced the greenhouse gas footprint of their model year 2012 passenger vehicles even below the levels required by U.S. EPA's new tailpipe emissions rules, according to a new report released today by the agency."

"The Department of Transportation is planning on sending a 'comprehensive' package of proposals regarding rail shipments of crude oil to the White House for its review [this] week."

"CHICAGO -- John Goihl, a hog nutritionist in Shakopee, Minnesota, knows a farmer in his state who lost 7,500 piglets just after they were born. In Sampson County, North Carolina, 12,000 of Henry Moore's piglets died in three weeks. Some 30,000 piglets perished at John Prestage's Oklahoma operation in the fall of 2013."

"The nuclear energy that Frank Benso uses to kill bacteria in fruit and oysters has won widespread support from public health officials and scientists, who say it could turn the tide against the plague of foodborne illness."

"Tornadoes ripped through the south-central United States on Sunday, killing at least 17 people in Arkansas and Oklahoma and wiping out entire neighborhoods, authorities said as rescue workers searched in darkness for survivors."

"A rare, frank conversation with the former vice president and climate-change activist."

"Prominent Republicans and conservative news media outlets rallied in recent weeks around the cause of Nevada rancher Cliven Bundy, whose armed standoff with authorities over grazing rights on federal land had made him an instant folk hero on the right. But Bundy’s GOP defenders, including Sens. Dean Heller (Nev.) and Rand Paul (Ky.), rapidly abandoned him on Thursday following reports of incendiary remarks that the white rancher made about minorities. Bundy wondered aloud whether blacks would be better off as slaves picking cotton, and alleged that people of color are 'against us.'"

"A February accident at a nuclear waste dump that resulted in the contamination of 21 workers resulted in part from "poor management, ineffective maintenance and a lack of proper training and oversight," a Department of Energy report concludes."

"Wyoming explosion: The town of Opal, Wyoming was evacuated, but no injuries were reported in an explosion at a facility that removes impurities from natural gas and serves large numbers of customers in the West."