Duluth's Great Lakes Aquarium, open since August, has lost its education director and two board members in a controversy involving a major funder. The flap started with a newspaper opinion piece by the education director opposing a power line proposed by Aquarium backer Minnesota Power. The controversy is heating up, just as public hearings on the line get underway in Wisconsin. Minnesota Public Radio's Stephanie Hemphill reports. Andrew Slade had been with the Great Lakes Aquarium for eight years during its planning and development. He designed and ran its educational programs. He's also a guest columnist on environmental issues in the Duluth News-Tribune. His September column criticized the proposed powerline, saying the environment would be better off if consumers reduced their electricity use, and power companies would develop solar and wind energy.