Compressed Natural Gas

I recently read an article about yet another alternate fuel. Compressed Natural Gas (CNG) is one of many new "environmentally friendly" options to write out the use of our good old coal. I had no idea that there were so many different types of fuels available. There's, ofcourse, hybrids, clean-diesel engines, fuel-cell technology, ethanol (which actually sounds quite familiar) and more. So far, only one major CNG car is being offered to the consumer market, and it's the Honda Civic GX. CNG has been certified for Ford and GM, amoung others, so these corporation have the option of testing it out, to see just how "environmentally friendly" it really is.