Did You Catch the Stanford Professor on David Letterman’s Show?

Late Show host David Letterman put aside his trademark humor for a serious interview recently with Stanford Professor Mark Jacobson.

Jacobson is a professor of civil and environmental engineering and senior fellow with the Stanford Woods Institute for the Environment.

The pair talked about alternative energy, plans for all 50 states to convert from fossil fuels to sustainable energy and climate change.

Watch the full interview above.