"The United States has joined China to formally ratify the Paris agreement to curb climate-warming emissions, the world's two biggest economies said on Saturday, which could help put the pact into force before the end of the year."

"Pope Francis has called for urgent action to stop climate change and proposed that caring for the environment be added to traditional Christian works of mercy such as feeding the hungry and visiting the sick."

"California will spend $900 million in revenues raised by its cap-and-trade program for carbon emissions and hold back $462 million for later under a deal reached yesterday by Gov. Jerry Brown (D) and Senate and Assembly leaders."

"President Barack Obama snorkeled on Thursday in the electric-blue water off Midway Atoll, a remote coral reef that serves as a reminder of both modern global climate challenges and the United State's dominance in the Pacific since its World War Two victory there."

"The chairman of the House Science Committee has announced a hearing next month into the refusal by two state attorneys general to comply with subpoenas seeking information on their investigations into ExxonMobil."

"President Barack Obama and Chinese President Xi Jinping are expected to formally commit their nations to last year's Paris climate change agreement in the coming days, a move that would increase pressure on other nations to follow suit and serve as an implicit rebuke to the deal's skeptics inside the U.S."

"It's as if Hillary Clinton and Donald Trump live on two entirely different Earths: one warming, one not."

"When President Barack Obama sets out this week to meet world leaders in China and Laos during his final presidential trip to Asia, he will make an unusual stop along the way."

"New England is running out of mussels. The Gulf of Maine's once strong population of wild blue mussels is disappearing, scientists say."