Vermont is striving to meet ambitious goals to get 90 percent of its energy from renewable sources by 2050. But just how renewable is some of that energy? We're talking with energy experts and environmental advocates about how we assess renewability and other environmental costs to alternative energy sources. 

Paul Hines, an electrical engineering professor at UVM and leader of the school's Energy and Complexity Group, joins Vermont Edition to discuss renewable energy in our region and the trade-offs of different energy sources. 
Listen to the interview on Vermont Public Radio