I think the idea is that the CO2 emitted from burning the tree is the same as is removed by the tree growing, so it cancels out. The tree is effectively a capacitor.
Fairly irrelevant when it comes to cattle though, as it's the methane that's the problem there.
You're going to get the methane anyway, even if you let all the plant matter the cows eat sit and rot.
Eh. Except there's a huge industrial ag machine creating cow-food, that wouldn't be doing that without the cows.
No, methane is a human-originated problem, and hand-waving won't change that.
Right, but doesn't that industry capture carbon?
Well, yes you would be doing that, unless everyone stops eating for example soya.
Soya's actually quite a good example because something like 80% of the mass of soya grown is only suitable for cattle feed, and we need to grow insane amounts of it for human food because it has basically no nutritional value for humans.
What are you going to do with all that? Pile it up and let it rot, emitting huge amounts of carbon dioxide and methane?