Biofuels are hydrocarbon fuels manufactured using plant matter. Their first use en masse dates back to World War II. In Oceanyka there are little agricultural operations dedicated to biofuels, they're more commonly manufactured from fast growing and dense local flora, as a side product of terrain clearing. The sheer availability of this plant matter makes biofuel cheaper than standard oil since the beginning of the Energy Crisis. However it does have several drawbacks. Biofuels may severely damage unmodified engines in the long run, require an expensive first investment for refineries and may carry the dreaded Hydrocarbon Disease under certain unknown circumstances.