Climate activist Tim DeChristopher’s trial began Monday in Salt Lake City, Utah.

He spoke with Grist recently about facing jail time, his fears, and how to make a difference through nonviolent direct action. Here’s the exclusive video interview:

Monday morning, Terry Tempest Williams, Daryl Hannah, and other allies rallied to show their support. Peter Yarrow is scheduled to be at the courthouse singing protest songs in support of DeChristopher’s climate activism.

You can read more about DeChristopher’s case here.