A spate of train derailments, most notably in East Palestine, Ohio, has reinvigorated the debate over the nation’s railroad infrastructure. Here’s how U.S. rail could be brought up to speed.

Brazil has long sought a greater role on the world stage, but political upheaval and other enduring challenges have complicated its efforts.

Responsible for powering the country and its economy, the U.S. energy grid has come under increasing strain due to climate change, and the threat of cyberattacks looms.  

China’s carbon emissions threaten global efforts to fight climate change. Its broader environmental degradation endangers economic growth, public health, and government legitimacy. Are Beijing’s poli…