Anne Gorsuch -- whose son has just been nominated by Trump for the Supreme Court -- was administrator of the EPA under Ronald Reagan.
How worried should you be about President Trump's first week? Pretty worried.
He signed executive memorandums paving the way for their construction, but it's not at all clear what this will mean on the ground.
At his final press conference, the president downplayed the importance of climate compared to issues like voting rights and press freedom.
It's not easy.
I-732 would have been a groundbreaking climate policy, but it was opposed not just by big business but by many environmentalists too.
A battle over a ballot initiative in Washington state has boiled over onto the national scene.
Sanders and four other senators sent a letter to Obama asking him to require a full environmental and cultural review of the pipeline.
After Friday's terrorist attacks, activists and organizers are deciding whether to scale back or cancel some planned events.