> because whatever get burned had once collected the carbon from the air.
(Not an expert, just guessing here)
That is a long-term part of it. Specifically, biomass is a lot better than fossil fuels because you are not introducing any more carbon into the long-term cycle. But it is not all about the amount of 'above ground' carbon. In the short term, what matters more is 'carbon in the atmosphere'. Here, biomass is net-zero only if either the plants being burned are re-planted (i.e. wood pellets) or the biomass would have rotted away anyway (food remains).
On the other hand, cows take up a lot of acreage that could be used to capture a lot more carbon if the fields weren't filled with just grass. Besides, the actual practice of keeping cows is quite resource intensive. And, as others have said, cows produce methane.
(Not an expert, just guessing here)
That is a long-term part of it. Specifically, biomass is a lot better than fossil fuels because you are not introducing any more carbon into the long-term cycle. But it is not all about the amount of 'above ground' carbon. In the short term, what matters more is 'carbon in the atmosphere'. Here, biomass is net-zero only if either the plants being burned are re-planted (i.e. wood pellets) or the biomass would have rotted away anyway (food remains).
On the other hand, cows take up a lot of acreage that could be used to capture a lot more carbon if the fields weren't filled with just grass. Besides, the actual practice of keeping cows is quite resource intensive. And, as others have said, cows produce methane.