Gary Abernathy has noted that natural gas is greener than oil, as carbon-to-output ratio goes. Abernathy may sound like a Reagan-era "catsup is a vegetable" pubbican, to some.
Where methane competes with biodiesel, methane isn't Renewable. But what if it is?
Since we're going to have landfills, why not take methane thence. Terraform exists, also, to convert CO2 into CH4. As for purely "green" fuels like hydrogen and ammonia: it is cheaper to extract these from methane than from (say) water, and anyway I don't like to lose water.
These technologies have made natural gas, if not fully GreenTM, at least a link in the chain to "grey" even "blue".
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