Lake Superior is one of the fastest warming lakes in the world. And when it comes to getting people’s attention about the warming, film is a powerful medium. In this episode of the Lake Superior Podcast, Walt Lindala and Frida Waara talk with film maker John Shepard about his upcoming documentary, “A Sea Change for Lake Superior.” John shares what his team at the Center for Global Environmental Education at Hamline University is doing to get the world out and ways we can be better stewards to protect our fresh water.