Jaguars could return to the US Southwest – but only if they have pathways to move north

Keeping landscapes connected can help protect wild animals and plants. In the US Southwest, border wall construction is closing off corridors that jaguars and other at-risk species use.

John Koprowski, Dean, Haub School of Environment and Natural Resources, University of Wyoming • conversation
April 19, 2022 • ~10 min

How border walls threaten species trying to escape rising temperatures

Nearly 700 species of flightless mammal could be barred entry to cooler habitats due to national borders by 2070.

Stephen Willis, Professor of Conservation Ecology, Durham University • conversation
Feb. 15, 2021 • ~7 min

Fences have big effects on land and wildlife around the world that are rarely measured

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.

Wenjing Xu, PhD Candidate in Environmental Science, Policy and Management, University of California, Berkeley • conversation
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.

Daniel Farber, Professor of Law, University of California, Berkeley • conversation
March 9, 2020 • ~9 min

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