DETROIT – Fuel prices are hovering near record levels, while turmoil in the Middle East threatens to cut off supplies of petroleum. Wherever you turn these days, you hear people talking about hybrids, diesels, ethanol, and fuel-cell vehicles.

But what exactly do these terms mean? Can they really reduce your fuel bills, trim back on imported oil, and lower harmful automotive emissions? Are any of these products are right for you? And are there any downsides?

TheCarConnection wants you to know all about “green machines” – whether you’re looking for a hybrid vehicle, a fuel-cell car, an electric SUV or a diesel commuter car.

To read this green machine primer, click on TheCarConnection.Com