Business Green: General Motors (GM) has today unveiled a purely electric concept car tailored for densely populated urban environments that aims to provide an entirely new class of zero-emission transport. The auto manufacturer’s Electric Networked-Vehicle or EN-V mini-vehicle was showcased earlier today at a pavilion at the Shanghai Expo, which it will share with Chinese joint venture partner SAIC Motor Corp. The Expo opens officially on 1 May and will run for six months. The two-wheel, …