Refiners Valero Energy Corp VLO.N, PBF Energy Inc PBF.N and Marathon Petroleum Corp MPC.N all lost billions in 2020. Marathon is seeking permits to convert a California refinery to produce renewable fuels, while PBF is considering a renewable diesel project at a Louisiana refinery. A renewable diesel boom could also have a profound impact on the agricultural sector by swelling demand for oilseeds like soybeans and canola that compete with other crops for finite planting area, and by driving up food prices.