The city assigned every tree — tens of thousands of them — individual email addresses. If a tree is vandalized, or diseased, you report it with that email.
Burrowed into the side of a mountain, on a Norwegian island deep in the Arctic, is the Global Seed Vault, a small building where vital seed varieties are kept in a deep freeze year round.
For 25 years, the Earth Conservation Corps has been cleaning up the capital's polluted Anacostia River. Volunteers have turned their lives around and now work to help others do the same.
The Florida Everglades is known for its beauty, and recently for its pythons. Efforts are accelerating to rid the ecosystem of the pesky invasive species. It's a huge story ... for journalists.
The Environmental Protection Agency asked for public input on "job-killing regulations" and has received more than 28,000 comments, many of which urge the agency notto roll back protections.
Predators that attacked the clay caterpillars left telltale bite marks, which were later analyzed to help figure the critter's risk of getting eaten. That analysis revealed a striking pattern.
Shell CEO Ben van Beurden says he wants the U.S. to remain in the 2015 Paris climate accord. Energy companies like Exxon Mobil and BP have also urged President Trump to continue supporting the deal.
The livelihoods of farmers and ranchers are intimately tied to weather and the environment. But they may no longer be able to depend on government research to help them adapt to climate change.
Climate change, dams and agriculture are threatening Chinook salmon, the iconic fish at the core of the state's fishing industry, a report predicts. And 23 other fish species are also at risk.