Christian Science Monitor: A plan to build thousands of new homes next to a lake in Maine’s north woods faces an environmental test that may one day challenge developers nationwide: What’s the carbon footprint of a new subdivision or land development? At hearings last month, Maine environmentalists unveiled for state regulators what is being called a first-in-the-nation study of the greenhouse-gas emissions expected from a huge development planned for Maine’s Moosehead Lake. Some observers call it a new front …