"Canada’s Natural Resources Minster Greg Rickford was on Capitol Hill again Tuesday pitching Keystone XL, as Senate supporters of the controversial pipeline tried to round up sufficient votes to override U.S. President Barack Obama’s threatened veto of any Congressional attempt to force approval of the project to ship Alberta oil sands crude to the Texas Gulf coast."

"New scientific sampling and analysis has found high concentrations of ammonium and iodide, two potentially hazardous pollutants, in oil and gas well drilling wastewater discharged into streams and rivers in Pennsylvania and other states."

"U.S. solar companies boosted their employee rolls by 22 percent last year, and now employ 86 percent more workers than they did in 2010, driven by rising demand in the world’s third-largest market."

"The White House announced on Wednesday that it is setting new goals for reducing methane emissions in the oil and gas sector, aiming to cut those releases by 40 to 45 percent from 2012 levels by 2025."

"The Environmental Protection Agency on Tuesday proposed new requirements for testing the toxicity and effectiveness of chemical dispersants used to break up oil spills."

"The Keystone XL tar sands pipeline faces a potential new legal challenge and the prospect of further delays from ranchers along its proposed route in Nebraska who say they “aren’t finished fighting” yet."

"Customers in 42 of the nation's 50 largest cities — including Charlotte and Raleigh — would save money by installing rooftop solar instead of buying all their power from local utilities, says the N.C. Clean Energy Technology Center."

"In President Obama’s latest move using executive authority to tackle climate change, administration officials will announce plans this week to impose new regulations on the oil and gas industry’s emissions of methane, a powerful greenhouse gas, according to a person familiar with Mr. Obama’s plans."