Climate change "is the global threat of our time," Obama said in a big speech at the Brandenburg Gate. Fitting, as the weather in Berlin was an unseasonably hot 92 degrees.
The world population is projected to soar from 7.2 billion today to 8.1 billion in 2025, so you can stop worrying about a shortage of babies.
Southern California Edison is officially giving up on the perpetually troubled San Onofre nuclear power plant. Anti-nuke activists are psyched.
TransCanada and Alberta hope former Kerry staffers will help convince the secretary of state that Keystone XL deserves a thumbs-up.
The Obama administration has been procrastinating its decision on Keystone XL for years -- and now it may kick the can even further down the road.
Republicans on the Senate Environment Committee boycotted a vote on Gina McCarthy, basically because they really don't like the EPA.
A Sierra Club activist says the veep told her he doesn't support building Keystone, but the vice president's office demurs.
Activists are pushing colleges and cities to divest, but it turns out many major environmental groups still haven't dumped their own dirty energy stocks, Naomi Klein reports.
Breed early and breed often. That was the gist of Mitt Romney's advice in a commencement address at Southern Virginia University.