[simon]

Originally Posted by freddie

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Plus I don't think the internal combustion engines are our biggest concerns right now. At least not since the almighty catalytic converter came along. There's much more carbon monoxide being produced by cows than cars these days.

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The main problem now is carbon dioxide, not carbon monoxide. Cars with catalytic converters are actually slightly less efficient and produce a bit more carbon dioxide. Cows don't produce any carbon monoxide. It's highly toxic for them, like us.