Nearly 700 species of flightless mammal could be barred entry to cooler habitats due to national borders by 2070.
Feb. 15, 2021 • ~7 min
Millions of miles of fences crisscross the Earth's surface. They divide ecosystems and affect wild species in ways that often are harmful, but are virtually unstudied.
Nov. 30, 2020 • ~10 min
From border security to climate change, national emergency declarations raise hard questions about presidential power
Declaring an issue is a national emergency lets presidents act quickly and with few constraints. But once they get this kind of power, it's hard to take it back – and it can produce bad policies.
March 9, 2020 • ~9 min