From FB reply
I’ve read there is research about feeding seaweed to livestock to reduce methane.
The livestock industry has had manure digesters that produce enough power to run the dairy farms, and this is a mature technology. They could also run the farm equipment using compressed methane AKA natural gas.
In any case the objective is to end the use of fossil fuels for livestock and dairy farming. The use of biofuels is a mature technology; the use of used cooking oil for diesel engines has been around for quite awhile. Most people don’t know that Diesel himself built his engine to run on vegetable oil.