Bolt comes with a trick-looking two-into-one exhaust system, which includes an oxygen sensor and exhaust gascatalyst that works with the closed-loop fuel injection system.
Not long after the California energy crisis brought deregulation screeching to a halt in 2000, utilities began predicting that legislation putting a cap on greenhouse-gas emissions would be the catalyst for change.
The carbon combines with the hydrogen in water to make carbon monoxide and hydrogen gas--the old "town gas"--but then the catalyst prompts a rejiggering of the atoms into methane (one carbon atom attached to four hydrogen atoms).