Automobiles are your largest single impact on the environment -- a full 23% of your Total Environmental Impact, and if you're a typical driver, it's costing you about $1900 a year. [read more]

According to the U.S. Environmental Protection Agency, using pure biodiesel (B100) instead of conventional diesel reduces these emissions: Hydrocarbons by more than 60 percent Carbon monoxide by more than 40 percent Particulates by more than 40 percent EPA studies also suggest that using biodiesel reduces the numerous toxic substances present in diesel exhaust (including many cancer-causing compounds). [read more]

No tailpipe emissions? Zero to 60 in 4 seconds? Super stylish and earth-friendly too? They're here, they're electric, and they're waiting for you to plug on in. Check out EVO's list of the 8 best electric cars on the market today. [read more]

Compared to gasoline, compressed natural gas (CNG) is cleaner, less expensive, and generally comes from domestic reserves. CNG vehicles store natural gas in pressurized tanks and burn the gas in slightly modified internal combustion engines. Natural gas, which is 90 percent methane, has a much higher octane rating than gasoline, allowing for higher compression ratios and therefore greater efficiency in the engines that use it. [read more]

One of the big advantages of hydrogen is that it's abundant: there is hydrogen in fossil fuels, alcohols—even in water. This means that hydrogen fuel can be made from a large number of feedstocks. Today, common ways of producing hydrogen include reforming natural gas (in which four hydrogen atoms are separated from a carbon atom) and electrolyzing water (which decouples two hydrogen atoms from an oxygen atom). [read more]