From Rio de Janeiro to Kanazawa, cities all over the globe are being recognized as biodiversity hot spots—and reimagining conservation in the twenty-first century.

Maybe it’s a sign that he knows his botched war has diminished his power. But he did add one caveat to his assent.

Whenever global trouble boils, our foreign policy big shots say U.S. credibility is at stake unless we act. Alas, the record shows that acting is often where the problems start.

Jared Diamond struggles to understand a connected world.

Donald Trump, in agreeing to meet with Russian President Vladimir Putin, seems willing to endorse countries flouting international law.

One professor decided to figure out why.

How American policymakers can learn from Denmark's mistake