Explainers

The urban heat island effect is a phenomenon whereby cities experience higher air temperatures than the surrounding countryside, making them more vulnerable to a warming Earth.

Cities concentrate people into small areas for good reason, but this makes them major sources of greenhouse gases and uniquely vulnerable to climate risks.

Concrete is among the world’s most consumed materials—second only to water. It also produces large amounts of heat-trapping greenhouse gases.

Biofuel is any liquid fuel made from “biomass”—plants and other biological matter like animal waste and leftover cooking fat.

Renewable energy is energy from sources, like wind, solar, and hydropower, that we cannot run out of.