You don't have to buy a hybrid to go green – but it sure helps.

Honda Civic GX

Available in California and New York, the Civic GX runs on compressed natural gas via a 113-hp, 1.8-liter engine with i-VTEC and an AT-PZEV rating. Unlike the Civic Hybrid, GX model has a standard five-speed automatic gearbox. Refueling is achieved using an at-home station called Phill, which can be installed both inside and outside to a regular home gas line. Refueling a nearly empty tank can take up to 16 hours, so Honda reminds GX drivers that doing so at night is most convenient.

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Honda Civic GX