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.
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.
A hand plugs in a charger into a white electric vehicle

Comparing Electric Vehicles

The difference between a conventional hybrid electric vehicle, a plug-in hybrid electric vehicle (PHEV), battery electric vehicles (BEVs), and fuel cell electric vehicles explored.

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.

Scientific Advisory Committees

A crucial resource helping policymakers use science to serve the public good, federal science advisory committees are facing unprecedented neglect under the Trump administration.