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Umbra on Gas

I go through the same turmoil as this Grist reader on choosing where to buy my gas — Exxon and Shell are definitely the most convenient, but I get that guilt pang every time I fill up. Umbra, Grist‘s advice columnist, gets to the nitty-gritty on who’s bad, who’s not so bad, and how guilt-ridden consumers can find out more.

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