Maybe this is why around 50 million bison didn't cause global warming. This is what studies say, "methane degrades in the atmosphere relatively quickly—it has a half-life of about 10 years—whereas CO2 is cumulative; that is to say a single emission of CO2 will remain in the atmosphere for many hundreds of years, and a series of them will accumulate, continually increasing the amount of global warming. So if emissions of the two gases are rising, then the global warming effect also rises, but more steeply in the case of CO2. If emissions of the two gases are constant, then the warming effect of methane is relatively constant, whereas the warming effect of CO2 increases as it accumulates in the atmosphere. Finally, if emissions of both gases are falling, then the net warming effect of methane begins to drop (in other words the drop in emissions has a cooling effect), whereas the warming effect of CO2 continues to increase, albeit at a slower rate, and only becomes constant when emissions cease altogether."
Now in the present, according to USDA data, "the U.S. cattle herd declined by around 20 percent from 114 million head in 1984 to 93.6 million head in 2017, a period of 33 years." So assuming methane emissions per cow remained approximately the same over that period, this means that methane emissions from the U.S. herd now have no net global warming impact, and are probably having a global cooling effect. So obviously someone is blaming cattle for something for which they are not guilty.
. Might have spelled his last name wrong.
