Here's a hoot: Oregon's leading climate change denier, Gordon Fulks, thinks the CO2 from human respiration contributes to climate change.
Here's Fulks' comment on a 7/26 article at Capital Press -- "The West's Ag Weekly Since 1928," titled "Editorial: Avoiding Portland traffic at all costs."
Note the highlighted portion. Fulks thinks human respiration is a sizable portion of human emissions.
Let's just cut to the chase: respiration is carbon neutral. Our bodies don't create carbon atoms, they just recycle them. The CO2 we exhale comes from (1) the CO2 we inhale, (2) the C-O2 joining of molecules where the carbon atom comes from the plants we eat, who themselves inhale carbon, and (3) from the carbon atoms in the meat we eat, which come from the plants eaten by cows, chickens, and pigs (etc), who inhaled CO2.
Respiration -- of ALL living things -- doesn't create carbon or CO2. We just recycle it.
If we (and the other breathing animals going back to 200 Myrs ago or before -- did create CO2, it would have been, with trillions of animals breathing (if not more), building up in the atmosphere and ocean at this time.
Of course, it was not.
It's hard to understand why anyone, denier or not, could get this so wrong.
Especially Fulks, who always makes a point of signing his name with his PhD, and who has more than once pointed out that he has the same education from the same alma mater (U Chicago) as James Hansen -- as if that gives him the same right to an opinion.
But let's play along a little bit. Global CO2 emissions in 2015 were about 38 Gt CO2 -- about 34 Gt CO2 from burning fossil fuels, and the rest from changes in land use.
Oregon's 2015 CO2 emissions, at least from burning fossil fuels, was 38 Mt CO2. That is indeed about 0.1% of global emissions.
Gordon thinks human respiration emits 60 times that, or about 2.3 Gt CO2. Divided by 7 billion people, that's 325 kg CO2/person/yr, or 0.9 kg CO2/person/day.
Which is indeed what I've seen referenced before.
Except none of it is new CO2. It's just recycled carbon atoms attaching to, when they get the chance, oxygen atoms.
It's not fossil carbon, buried for a few hundred million years.
It's carbon already in the atmosphere-land-ocean system, cycling around as carbo does. That's all.
Fulks is flat out wrong.
I wonder if the denier groups he's "affiliated" with -- once the Cascade Policy Institute in Oregon, and, still it appears, and the Heartland Institute -- care that one of their people is making freshman-level errors.
OR maybe they're used to it.