Fart contains about a quarter of Carbon Dioxide with some other
chemicals. The amount of methane is not that much, about half of
carbon dioxide.
When we say that solid wastes (human or animal) can be use as a
fuel, it is the remains of the food that can't be absorbed by our
body. So if you eat tonnes of meat and expect your sh!t to be
flammable, I think you will be disappointed. Besides, the cow dung
used as fuel were dried, so if you dry your waste combined with
your vegetarian diet, I think it could be used as fuel as
well.
Btw, this one is just a sidenote. Now scientist is blaming bovines
for being the culprit for the greenhouse effects. They said that
the methane and carbon dioxde they produce is so high that the
greenhouse gases produced by humans oales in comparison. Isn't it
smart (of the "scientist") to push the problem to others? If we
look into the problem, wasn't the human's needs the cause of the
"overpopulated" bovines?