There is nothing natural about the global domestic cow population. There are one billion domesticated cows on the planet. A natural, undisturbed ecosystem would never, ever, under any circumstances allow anywhere near that number of bovine species to exist. The worldwide cow population is a result of human intervention - breeding, domestication, food supply.
And that is not even to mention the resources, the pollution emissions, and the industrial technologies required to support a billion cattle and livestock industry on the planet.
When Trump boot-lickers giggle about cow farts, it is because they heard about it on the Rush Limbaugh show and assumed it was a good dig a "liberal environmental lunacy".
It also points to the fact they are fairly uneducated, unintelligent, and have not really put the slightest thought into what a global livestock industry really means in terms of environmental impact and greenhouse gas emissions.