Related, is a human "thinking out loud" still thinking, even though the internal reasoning is "immediately dumped into the external environment"?

I don't know if people generally know the difference before that, but personally it's only been recently that I've been exposed to sources that distinguish between left and liberal.

Also dopamine is a precursor to noradrenaline, and serotonin levels are affected by numerous drugs, the most popular of which are antidepressants. That "supplements" for these neurotransmitters has more to do with how effectively they cross the blood-brain barrier and how they might disrupt the gut, since many chemicals in the brain do double duty through functions in both brain and gut.

I would still guess that lawnmowers produce more emissions overall, given that there are so many more mowers than tractors. But they get used less often than tractors, so who knows? Either way, I agree with your thinking process, that the most economical way to reduce overall emissions is to focus on what are actually producing the bulk of emissions.

I don't know how much better cars and trucks can get, and for mowers maybe electric is the answer. Mine is gas-powered, and I know it runs rich. I would love to come inside after mowing and not smell like fuel, so I'm in favor of better emissions controls on mowers.