If all the cows in the (livestock/farming) world were given Beano to prevent them from giving out methane, how much of an impact would it have on climate change?

https://www.quora.com/If-all-the-cows-in-the-livestock-farming-world-were-given-Beano-to-prevent-them-from-giving-out-methane-how-much-of-an-impact-would-it-have-on-climate-change