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Portland won’t weaken its policy to phase out petroleum diesel and replace it with biofuels
(www.oregonlive.com)
Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.
As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades:

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As far as I know, mandatory use of biofuels is primarily a subsidy for farmers rather than a means of reducing emissions. I'm surprised to see an urban area focus on it.
It sounds like Portland is making an effort to avoid the farm-subsidy sort of biofuels, but then what is it actually demanding that biofuels be made from?