On Nov 20 some Maryland environmental groups formally entered the fray over the Piedmont power line proposal, issuing a letter that calls for the project to receive a stringent environmental review through a federal law. On Nov 20 some Maryland environmental groups formally entered the fray over the Piedmont power line proposal, issuing a letter that calls for the project to receive a stringent environmental review through a federal law. Environment Phys.org – latest science and technology news stories