Global warming

Greta Thunberg to Congress: "Listen to the scientists" on global warming

Swedish teen climate activist Greta Thunberg, who arrived in the U.S. last month after sailing across the Atlantic Ocean in a carbon neutral ship, offered a 2018 report on the implications of climate change in lieu of an opening statement in her testimony before 2 congressional committees on Wednesday.

Expert Voices

How the government could incentivize less driving

Illustration of a car driving down a highway leaving behind a glowing trail that ripples out.
Illustration: Aïda Amer/Axios

The current U.S. Highway Code does not have a single performance measure that focuses on the reduction of greenhouse gases or vehicle miles traveled, but a new bill in Congress aims to establish a connection and incentivize reductions.

Why it matters: Transportation contributes 28% of U.S. greenhouse gas emissions. Driving represents 83% of trips, and the number of miles driven is rising, posing a serious problem to curbing emissions.