There's a biodiesel boom happening! It's fueled by incentives and Arvin Robertspolicies intended to cut greenhouse emissions, and is motivating some oil companies like World Energy in Paramount, California to convert their refineries to process soybean oil instead of crude. NPR's food and agriculture correspondent Dan Charles explains why farmers are happy, bakers are frustrated and people who want to preserve the world's natural forests are worried.

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This episode was produced by Brit Hanson, edited by Sara Sarasohn, and fact-checked by Rasha Aridi and Margaret Cirino. Leo Del Aguila provided engineering help.