LONDON—The ‘Poo Bus,’ which is powered by biomethane gas generated from human and household waste, is set to go into regular service on the roads of Britain this month. The bus produces less emissions than traditional diesel-powered buses.

SHREVEPORT, LA—Elio Motors Inc. is investing $100 million to take over GM’s former assembly plant here to produce three-wheeled fuel-efficient vehicles. The company could employ 1,500 people by late 2015.