One locally produced podcast that is gaining popularity is Earthwatch Radio, which is distributed to 120 commercial radio stations and other media outlets across North America. Since 1972, the program produced by the staff and students of the Sea Grant Institute and the Gaylord Nelson Institute for Environmental Studies at UW- Madison has provided news and information on advances in science and environmental protection. Earthwatch Radio’s podcast is helping it build an international audience, Web producer Richard Hoops said.