As climate change worsens, the need for a transition from fossil fuels to clean energy sources gets more urgent. But clean energy often has its own environmental costs. The risks posed by nuclear reactors and mining lithium for batteries are well known, but our speaker, Dr. Peter Ladwig, a materials scientist, is working on another aspect of the problem: dirty magnets used in the electric motors that power green transportation. In a "Town Talk" sponsored by Telluride Science, he d...