Halfway through 2012 and here's Green Car Design's second review, April - June 2012: Supercars. Headlines: Vauxhall Ampera, Renault Twizy, Porsche Panameras, Rimac Concept_One on sale and Lightning's GT almost there. Plus the exclusive thoughts of Peter Stevens, supercar designer extraordinaire, as well as Michael Mauer (Chief of Design, Porsche) and Mark Adams (GM Europe).