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Originally Posted by Afrersize
If its not as strong a greenhouse gas then why not stop drilling CNG (which is about the same thing) so much, and just tap into landfill/sewage treatment/animal methane gas?
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You won't get the necessary volumes by tapping into the alternative NG sources, but it is already being done.
In some countries in Europe, you can buy "bio"gas, which is methane sourced from landfills, sewage, cattle farms, ...
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I read somewhere that methane gas is a greenhouse gas 23 times as heat trapping as CO2,
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That's when methane gets into the atmosphere, i.e. without burning it.
There's plenty of that happening naturally - at sea, in thawing permafrost, ...
Drilling for gas lets some more of it escape - either as raw methane, of it gets burned off (using flares) when it can't viably be transported to shore.
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but yet CNG produces 21% less greenhouse gas emissions than gasoline.
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That's when you burn it.