Since the disastrous BP spill in 2010, environmentalists have kept watch over Louisiana's coastline. One consortium says there's far more oil leaking into the Gulf than companies are reporting.
Local and federal authorities worry over a rise in North Dakota's drug trade. Sharon Cohen of the Associated Press explains the proposed solutions to the issue, which some tie to the recent oil boom.
One researcher who participated in the latest U.N. report on climate change says the final product is simply too depressing. Others say the somber tone is justified — but that humans can also adapt.
Thanks to fracking, there is an abundance of natural gas at about a quarter of the European price. This influx of business may be good for the U.S., but it's cause for concern for European leaders.
An accident at the site appears to be more serious than first disclosed. Nobody knows what happened, but it's shaping up to be a major setback for the nation's only dedicated nuclear waste dump.
Methane is a potent greenhouse gas from oil and gas production. The rules require companies to find and repair equipment leaks. The rules also will reduce air pollution that contributes to smog.
The country is producing more natural gas than it can burn, but frigid weather has made it harder for companies to deliver that gas to those who need it, especially in densely populated areas in the Northeast. As a result, prices have skyrocketed.
The National Transportation Safety Board is calling for the swift enactment of tough new standards on trains carrying crude oil. With the huge increase in oil shipped by rail across North America, safety officials warn another major disaster could be looming.
This week in Iran, international inspectors are stepping up surveillance of the country's nuclear program. The inspections are at the heart of a landmark deal that freezes Iran's uranium enrichment in exchange for billions of dollars in relief from sanctions, but they are just a first step.