Or find ways of harnessing all of those fxrts, piles of shxt and process them into methane to power our vehicles !!!
You may be more on point than you realize with that comment, Domtoni!
Back in the late 1970's I worked for a builder during the summers. One summer we built a huge solar heated building in which hogs were going to be raised. As part of that construction project, "canals" were built over which slotted flooring was placed, and the hogs were to reside on those slotted floors. A pond was constructed outside with a plastic/fabric cover for this purpose:
There was a timed system that included a contstant service pump connected to a huge elevated tank outside. At the end of the specified time interval, the tank would dump at great volume the contents, which would wash over the slotted flooring and "flush" the feces/urine from the hogs down into the "canals", which would then carry the waste out to the pond. The waste material would create methane, which was captured by the cover, and a piping system was created to carry the methane gasses to heaters in the building, and the constant service pump would fill the huge outdoor tank for the next "flush". The combination of solar gain from roof panels and the methane-fired heaters would keep the hogs warm during the cold Kansas winters, making the project almost totally self-sufficient in power production...about the only electricity used was for lighting and to run the timing system and pumps.
There is no reason that the process could not be used with cattle (although, having worked on a cattle ranch for 9 summers during high school and college, I can see some issues), sheep, etc.
The issue, though, is that even if we do capture waste-material created methane and burn it in our GT40s, we still contribute to global warming by using the combustion process....and even if we go totally electric, the generation/creation of that electricity creates either nuclear byproducts or pollutants that cause atmospheric alterations that contribute to global warming.
The hog-shed was an interesting project, though, I must admit. I have no idea if it is still standing or operational, but would like to find out. It was a large-scale project, but IMHO the concept could be scaled down and used for individuals to help us reduce our fossil-fuel needs, even if we never get there for our automobiles.
Cheers from Doug!!