All explainers

Closeup of COVID-19 vaccine being injected into a person's arm

COVID-19 Vaccine FAQ

As COVID-19 vaccines become more widely available, it's important to have access to reliable scientific information. Here are answers to the most common questions.
cornfield in a drought

Drought and Climate Change

Learn about the different types of drought, the many factors that contribute to their development, and how climate change can have a significant effect on many of them.
A pie chart showing emissions per country by percentage, 2018

Each Country's Share of CO2 Emissions

Which 20 countries emit the most carbon dioxide? This table shows data compiled by the Energy Information Agency, which estimates carbon dioxide emissions from all sources of fossil fuel burning and consumption.

What is ZEV?

The Zero Emission Vehicle (ZEV) program is a California state regulation that requires automakers to sell electric cars and trucks in California.

The Endangered Endangered Species Act

Our planet's rich variety of plant and animal life provides many important products and services—from foods and medicines to clean water and pest control—as well as a multitude of less tangible benefits.

Coal Power Impacts

Formed deep underground over thousands of years of heat and pressure, coal is a carbon-rich black rock that releases energy when burned.