Automakers Tout Electric Future While Building More Diesels

As a commitment to a post-carbon future of zero-emissions electric vehicles, General Motors Co. is converting its Detroit-Hamtramck Assembly plant to the manufacture of electric trucks. Auto analysts forecast the vehicles will not be obscure green compacts, but the meat of GM’s big-vehicle lineup: GMC Sierra, Cadillac Escalade and a return of the Hummer.

At the same time, it is introducing for the first time diesel versions of its Chevy Tahoe and Suburban SUVs, and the Silverado pickup.