Mercedes-Benz and Porsche are showcasing curvaceous, high-end electric sports cars at the Frankfurt auto show as part of an industry effort to counter Tesla, avert billions in European pollution fines and defuse complaints from climate activists. Germany's premium automakers are now marketing electric cars as their flagship models, a strategy which Daimler, Volkswagen and BMW hope will lure customers away from gas-guzzling SUVs that could soon land them