With the European Union tightening restrictions on carbon emissions, danger has been spelled out in big bright letters for the sportscar-makers we know and love. The bulk of the world's best supercar manufacturers - including Ferrari, Lamborghini, Lotus, Aston Martin and Porsche - reside in Europe, but while industry executives continue to campaign for exception and protection, things don't look good. There are, however, a few solutions that could keep the exotic automakers in business and unmolested.