Coal makes more pollution than Diesel.
Link
here we are. 2008 A.D. We are long past Buck Rogers, The Jetsons, and Back To The Future Anti-Gravity Skateboards. We should of been 90% on Renewable, non-polluting resources by using Wind, Heat, Geothermal, Solar, and Gravitational Pendulums
(Link- Foucault's Pendulum) by the late 90's, but it's all about politicians and the companies they own stock in.
There is no excuse for the way we live today.