Inserting a biofuels loophole in the EU 2035 cars law could see a huge spike in demand for biofuels from waste feedstocks like animal fats, used cooking oil and palm oil by-products, new T&E analysis finds. A car running on animal fats, for example, would require the equivalent of 120 pigs a year. This additional demand could lead to cars, planes and ships consuming two to nine times more advanced biofuels than can be sustainably sourced in the future.