Each Friday, I look at what the presidential contenders are saying about foreign policy. This Week: The demise of arms control agreements and the rise of geopolitical competition are a dangerous mix…

By withdrawing from the Paris accord, the United States—the second-largest global emitter—could undercut collective efforts to reduce emissions, transition to renewable energy sources, and lock in fu…

In Dubai, leaders should focus their attention on policy solutions for vulnerable regions where climate change is amplifying the consequences of armed conflict and compounding failures of governance…

Committed global action at every level of government, the economy, and society is needed to tackle such a complex, multifaceted challenge, and a growing awareness that time is running out should help…

The sprawling U.S. water system is central to the nation’s economy, but chronic underinvestment, increasing demand, and the consequences of climate change have revealed the system’s weaknesses.