Representatives of Virginia Clean Cities joined car manufacturers and industry experts at a Richmond Expo to showcase new technologies and vehicles powered by natural gas. They say such vehicles can produce significantly lower levels of emissions than traditional fuel sources….and that switching one waste truck has the pollution-reduction impact of removing 325 cars from the road. And as Virginia Public Radio’s Anne Marie Morgan reports, the advocates also say the idea of switching to natural gas for public and private fleets is catching on across the Commonwealth.