Michelle Obama's new book, "American Grown," reflects on the first lady's move away from food policy and toward individual and grassroots efforts.
It’s been a tough few weeks for the forces of climate-change denial. But let's not forget how effective they've been over the years.
West Virginia coal activist Maria Gunnoe testified before a congressional committee about her community's ruined water supplies. Instead of action, her evidence triggered a conversation with the Capitol Police.
Seventeen-year-old Brittany Trilford says it's time for presidents, prime ministers, and corporate bigwigs to stop destroying the planet. Later this month, she may get to deliver her message in person.
Move over, big-ass dams. Hydropower is getting a makeover thanks to a new type of hydrokinetic turbine that runs in canals and spillways.
Meet Andrea Northrup, a 25-year-old working to bring local foods into the public schools of Washington, D.C.
A reader asks if it’s ethical to mine asteroids. Umbra takes us on a voyage of discovery.
Facebook is going to try to turn personal relationships into an advertising medium. That will be a big turn-off -- and will spur the search for better alternatives.
Just over a year ago, New York's transportation commissioner was raked over the coals for her romance with bikes. Now, it seems the city has fallen for them too.