"A state appeals court on Thursday ruled California's high profile market system for reducing greenhouse gas emissions does not amount to an illegal tax, a decision that could lift a pall over the so-called cap-and-trade program's marketplace for buying and selling pollution allowances."

"Australia could be on the frontline of a new wave of “climate refugees” displaced by extreme weather events, droughts and rising seas, a US expert on the national security impacts of climate change has warned."

"A coalition of 17 U.S. states filed a legal challenge on Wednesday against efforts by President Donald Trump's administration to roll back climate change regulations, deepening a political rift over his emerging energy policies."

"For years, cutting carbon emissions to stave off the worst impacts of climate change was routinely near the top of the agenda at talks between the leaders of the United States and China. Not anymore."

"Some big American coal companies have advised President Donald Trump's administration to break his promise to pull the United States out of the Paris Climate Agreement – arguing that the accord could provide their best forum for protecting their global interests."

"New climate change evidence from recent government studies could affect the coming legal fight over President Trump’s revived permit for the Keystone XL pipeline."

"A lawsuit by ExxonMobil seeking to block climate change fraud investigations by the attorneys general of Massachusetts and New York has been dismissed—at least for now. The ruling came from the New York federal judge who took over the case last week after a judge in Texas transferred it to her jurisdiction."

"Within hours of moving by executive order to dismantle U.S. actions on the climate change crisis, the Trump Administration asked a federal court to stand down on pending litigation over the Clean Power Plan. The legal salvo could keep regulation of carbon dioxide emissions from fossil fuel power plants in limbo for the foreseeable future."

"The U.S. Environmental Protection Agency's scientific integrity watchdog is reviewing whether EPA chief Scott Pruitt violated the agency's policies when he said in a television interview he does not believe carbon dioxide is driving global climate change, according to an email seen by Reuters on Friday."