I am not sure what they are attempting with this but rumor has it that Toyota is working on a 2021 Mirai that will run on cow poop.
I have a lot of questions when it comes to something like this but if it is possible, this is something that can impact the future of cars.
Toyota has been interested in cow manure for several years. In 2017, the Japanese company announced with Shell that they were building a power plant in Long Beach, California that would capture methane gas from dairy cattle manure and convert it into water, electricity, and hydrogen. The companies went ahead with their project, called Tri-Gen, as a "hydrogen-truck refueling station" in 2018.