"Royal Dutch Shell submitted a plan to the federal government on Thursday to try once again to explore for oil in the Alaskan Arctic, following years of legal and logistical setbacks as well as dogged opposition from environmentalists."

"PITTSBURGH - Six years into a natural gas boom, Pennsylvania has for the first time released details of 243 cases in which companies prospecting for oil or gas were found by state regulators to have contaminated private drinking water wells."

"There are some countries in the world where the air is so polluted you can forget about coming home with a healthy holiday glow."

"ExxonMobil Corp. has agreed to pay $1.4 million to settle federal claims arising from a 2012 crude oil pipeline spill in Louisiana."

"DuPont Co. has agreed to pay nearly $1.3 million in fines to the U.S. Environmental Protection Agency to resolve violations the EPA cited after a string of 2010 chemical leaks, including one that killed a worker at the company’s plant in Belle, EPA officials announced Wednesday."

"Tyson Foods could lose around $500 million in government contracts if found guilty in and ongoing criminal probe by the Environmental Protection Agency over the recent release of toxic chemicals at a plant in Monett, Mo."

"A massive stream of wastewater tainted with hydrocarbons has been flowing into Utah from oil and gas mining on Colorado’s West Slope."

"Trout caught in Torch Lake, Mich., are not safe to eat. Groundwater in Baldwin, Fla., is not safe to drink. Six acres of land in Bridgewater, Mass., are not safe to live on."

"Coal ash from earlier environmental disaster is causing health concerns for poor African-American residents."

"An oil pipeline spill that contaminated a river in the northern Mexican state of Nuevo Leon will take months to clean up, the country's top water authority said on Thursday."