Certain chemicals chewed a hole in Earth's ozone layer. But regulating those substances doesn't seem to have made much difference.
Research suggests harnessing ocean wind could power the entire globe - but it comes with some major obstacles.
Regime leader Kim Jong-un said President Donald Trump would "pay dearly" for saying the U.S. would "totally destroy" North Korea if needed.
Local media reports Nicaragua initially refused to join because it thought enforcement wasn't strong enough and that it "was not realistic."
Electric vehicle maker Proterra says one of its buses set a record for distance traveled on a single charge, but it's not for sale yet.
The Secretary of Interior suggested shrinking four monuments and allowing commercial activity on 10 of them.
Illegal sand extraction has wide-reaching social, political and environmental effects.
Soft robots require a bit of labor to create, but researchers have figured out a cheap way for homeowners, teachers and hobbyists to make their own.
Plastic bags have become so pervasive in the environment that they're starting to make their way into the food chain.
The so-called ban was an effort to reduce plastic waste. The Trump administration says visitors should decide how to stay hydrated.
Scientists recently created self-repairing robots, which could help make soft technology more durable.
Hotter temperatures lengthen the time it takes for an ecosystem to fully recover after a dry spell.