Demand for biofuels has been growing in many parts of the world. …Disruption to oil exports via the Strait of Hormuz this year created a further incentive to switch to biofuels to ensure energy security. While biofuels can’t fully replace petroleum, they can be blended into gasoline and diesel, allowing countries to stretch existing fuel supplies. Many environmentalists contest the idea that biofuels are a sustainable alternative source of energy. And as more farmland is used to produce them, there’s less available to make food, increasing the risk of global food shortages and hunger in the poorest nations. …The priciest biofuel is sustainable aviation fuel, or SAF, which uses advanced refining processes to convert waste oils into jet fuel that can be blended for use in aircraft. There’s also so-called advanced or second-generation biodiesel, made from non-food sources such as crop waste, wood chips and even algae, which avoids competing with food crops.