"On Thursday, Sen. Bernie Sanders (I-Vt.) offered a simple amendment to the controversial bill that would authorize construction of the Keystone XL oil pipeline. Sanders' measure, which he proposed to the Senate Energy and Natural Resources Committee, would have declared it the "sense of Congress" that climate change is real; that it is caused by humans; that it has already caused significant problems; and that the United States needs to shift its economy away from fossil fuels."

"Nebraska’s Supreme Court on Friday cleared the route for the Keystone XL pipeline, removing a major hurdle for the project as Congress and the president fight over it."

"The Keystone XL pipeline, which would carry crude oil from Canadian oil sands down to the U.S. Gulf Coast, isn't just an infrastructure project. It's also a symbol for the fight over the future of energy."

"Environmental advocates will lose an ally in Congress when Barbara Boxer leaves the Senate at the end of her term in 2016 after more than three decades in office."

"The Environmental Protection Agency said it will delay carbon rules for power plants, missing a deadline set by President Barack Obama in one of the centerpieces of his climate-change agenda."

"International trade agreement proposals could roll back protections from harmful pesticides in the US and EU, according to a new report expected to be released Wednesday."

"The U.S. Forest Service has abruptly decided not to spend $10 million on a five-year nationwide public relations campaign to brand itself as a public agency that cares about people and nature."

"RIO DE JANEIRO — Calling Aldo Rebelo a climate-change skeptic would be putting it mildly. In his days as a fiery legislator in the Communist Party of Brazil, he railed against those who say human activity is warming the globe and called the international environmental movement 'nothing less, in its geopolitical essence, than the bridgehead of imperialism.'"

"In an inaugural address drawing on his family's deep roots in California, Gov. Jerry Brown called for expansive new environmental regulations that would protect the state for future generations."

"The White House issued a veto threat Tuesday for pending legislation intended to force federal approval of the Keystone XL pipeline."