"Oil prices tumbled below $50 a barrel on Monday, spooking global financial markets and signaling that the remarkable 50 percent price drop since June was continuing this year and even quickening."

"The electric power generation sector lost more than 5,800 jobs over the last three years, according to an Energy Department stat shop. The losses hit all energy sources across electric power except for renewables, the Energy Information Administration said on Friday."

"Greenhouse gas emissions by the world's top 500 companies rose 3.1 percent from 2010 to 2013, far off the cuts urged by the United Nations to limit global warming, a study showed on Monday."

"The Commerce Department began closing a chapter in a protracted trade conflict with China over solar equipment Tuesday, approving a collection of steep tariffs on imports from China and Taiwan."

"Amid the shouting on Capitol Hill, the wads of campaign cash and the activist careers shaped around the Keystone XL pipeline, the project at the flash point of America's energy debate now confronts a problem bigger than politics. It may no longer pencil out."

"Hotter days mean less cold cash for Americans, according to a new study matching 40 years of temperatures to economics."