Diesel can be made from just about any carbon-based source, but the process can be expensive and wasteful. Chemists are working on new methods to fix that.
By Rebecca Jacobson, Inside Energy
A primer on fueling natural gas vehicles at Denver's UPS branch.
Environmental Protection Agency chief Mike Leavitt signed new regulations Tuesday aimed at cutting pollutants from diesel engines in off-road vehicles such as farming and construction equipment by 90 percent over the next eight years.
By PBS NewsHour
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