Transportation is responsible for one quarter of the world’s greenhouse gas emissions. While companies have touted electric vehicles and sustainable aviation fuel as ways to cut emissions from air and ...

This story is part of The Salt Lake Tribune’s ongoing commitment to identify solutions to Utah’s biggest challenges through the work of the Innovation Lab. [Subscribe to our newsletter here.] If you ...

A correction to an earlier version of this article has been appended to the end of the article. Since Caltrain has switched to electric trains, their retired diesel fleet will be sent to Lima, Peru, ...

Sitting inside a diesel train, you can be exposed to more pollution than if you were standing next to a busy street at rush hour. The trains are still common—especially in the U.S. But in Germany, one ...