> The source of the emissions doesn't matter to how negative the externality is
It does, though. We seem to have lost sight of the sustainability dimension of our planet. Cows can fart all day long and the carbon/methane cycles will recapture it, sustainably. In contrast, we cannot pull oil out of the ground in any sustainable way, since it was all created 100 million years ago in a one-time geological event that is unlikely to ever occur again in the history of Earth
It does, though. We seem to have lost sight of the sustainability dimension of our planet. Cows can fart all day long and the carbon/methane cycles will recapture it, sustainably. In contrast, we cannot pull oil out of the ground in any sustainable way, since it was all created 100 million years ago in a one-time geological event that is unlikely to ever occur again in the history of Earth