Generation Change
A new digital map of Earth's seafloor reveals that the ocean is more complex than we thought.
New research suggests that 130,000 species are gone forever.
Why "cow power" could be the next big renewable energy source.
Taking in the splendor of mountains, lakes and sunshine can be a spiritual experience.
WHAT'S HAPPENING
New safeguard proposal would "vastly weaken" protections, they say.
"What are you going to do about it?"
Legislators could have passed a climate change law to supplant Obama's regulations, but they didn't.
The new regulations depend on the next president to enforce them.
Final rule on power plants includes tougher emissions cuts and more renewables.