Severe heat waves have been hitting India since April, forcing many of the country’s essential workers to make tough decisions.

The biggest episodes of the past have altered the course of human events, according to researchers. An emerging one is drawing historic comparisons.

Dozens of countries met this week to discuss how to end the world’s dependence on fossil fuels, a goal that the Trump administration doesn’t share.

Blocking the narrow waterway between Russia and Alaska could help stabilize a vulnerable system of ocean currents, scientists found in a study.