Harry Stevens

The Northeast, which has warmed faster than the rest of the country, saw the biggest jump in mosquito days. Look up how mosquito season has changed in your town.

Seasonal temperature trends show how, decade after decade, global warming is unfolding across the planet — from New York to Shanghai to your own backyard.

Fracking supporters have long touted it as a green technology. Enhanced geothermal energy is finally making that a reality.

A Washington Post analysis of a trove of meteorological records shows the extent of life-threatening heat across the globe.

New research shows that by 2050, large areas in California, Arizona, Nevada and Texas will experience months of temperatures high enough to compromise the grid.

Spending time in nature is linked to a longer, healthier life. But nature is not distributed fairly across the country.

Readers told us how spring has changed where they live. Look up your town to see when leaves are sprouting and how spring’s arrival time has changed.

Look up your city to see how winter temperatures have changed since 1980. Most regions across the U.S. have seen warmer winters, with New England warming the fastest.

The U.N. wants to protect 30 percent of the planet. Many of the areas it counts towards that goal are small and oddly shaped. Can contorted shapes save nature?

Two hundred years after the discovery of the greenhouse effect, a new animation of our atmosphere shows how humans add more carbon dioxide than Earth can absorb.