"Environmentalists have a hope. If they can block the Keystone XL pipeline, they can keep Canada from developing more of its dirty tar sands oil. It takes a lot of energy to get it out of the ground and turn it into gasoline, so it has a bigger greenhouse gas footprint than conventional oil. But the State Department report, which was released Friday, says Keystone won't have much of an impact on the development of that oil from Alberta."

"A US court has declared the conservation group Sea Shepherd to be 'pirates' and ordered it to stop its aggressive actions against Japanese whalers."

Two retired outdoorsmen -- with help from water researchers -- are testing streamwater in western Pennsylvania. They are struggling to get EPA attention to chemicals they fear could be related to the fracking boom.

"Sea Shepherd is claiming victory after Japan temporarily suspended its annual whale hunt in the Southern Ocean."

"Fresh off a wave of success in the California Capitol last year, animal welfare groups are taking aim at a new target this year: hunting with lead ammunition."

"SOUTHERN OCEAN -- The Japanese whaling factory ship Nisshin Maru has collided with two whale conservation vessels and its own refueling tanker in Australia’s Antarctic waters, damaging the other ships. No injuries are reported."

A Texas company quit plans to build a coal-fired power plant -- blaming President Obama's environmental rules, but admitting the low price of natural gas was a key reason.

"Event billed as largest climate protest in US history intended as show of force as Obama nears decision on controversial project."

"Anonymous billionaires donated $120m to more than 100 anti-climate groups working to discredit climate change science."

"The US Supreme Court has denied a plea from anti-whaling group Sea Shepherd to end restrictions on its movement as Japan's whalers accused the activists of violating orders to stay away."