When a deadly landslide hit Sitka, Alaska in 2015, it sparked conversations about safety and risk. The community has an early warning system for tsunamis. Could it work for landslides? Or would another solution have to be developed? Producer Molly Segal finds out. Then -- with climate change...

Come with us to California where entrepreneurs are sending balloons full of sulfur dioxide into the stratosphere. It’s a form of solar geoengineering known as stratospheric aerosol injection, and the company Make Sunsets isn’t waiting for scientific consensus before they launch. We hear about...