Note that biofuels aren't especially environmentally friendly, even just considering carbon emissions. See e.g. [1], which makes the most optimistic possible assumption by ignoring land use changes and still concludes "the reductions for most feedstocks are insufficient to meet the GHG savings required by the EU Renewable Energy Directive" (second generation biofuels may do better, but that isn't clear). Also ignoring land use changes is a very bad asssumption; if your plan is to run global shipping (or other industries) on biofuels it seems highly implausible that it's not going to end up with more land overall used for growing crops. If that's land that could otherwise be sequestering carbon (e.g. drained peat bogs, which have the advantage of being highly fertile), then it's clearly going to be a significant contribution to carbon emissions (not to mention the ecological impacts of converting yet more land to agriculture).[1] https://royalsocietypublishing.org/doi/10.1098/rspa.2020.035...
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