The Colosseum in Rome is being cleansed of car exhaust that has built up over decades, ever since Mussolini's ill-advised decision to build a major road nearby.
Diesel exhaust is pretty nasty stuff. Pass an overloaded 18-wheeler clouding up the highway, and that acrid plume of hydrocarbons will overpower even your best little tree air freshener. As new research lays out, that exhaust doesn't just smell bad, it messes with the scent of flowers. And that's big trouble for our …
General Motors Thermoelectric Generator This module could capture waste heat in your car's exhaust and convert it to energy, improving fuel economy in a Chevy Suburban by 3 percent. GM