CNBC: Inspired by Al Gore’s documentary on global warming, “An Inconvenient Truth,” more than three years ago, 12-year-old Walter Schoolman told his mom he wanted to help reduce his impact on global warming and “go solar.” Photo: Mt. Pleasant Solar CooperativeAnya Schoolman and the other founders of the Mt. Pleasant Solar Co-op The Schoolmans, along with another neighborhood family, started to research what it would take to install solar panels on their roofs. “We called a …