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this post was submitted on 11 Sep 2023
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Mildly Interesting
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This is for strictly mildly interesting material. If it's too interesting, it doesn't belong. If it's not interesting, it doesn't belong.
This is obviously an objective criteria, so the mods are always right. Or maybe mildly right? Ahh.. what do we know?
Just post some stuff and don't spam.
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Why not? Probably because:
Bike pollution: .
Car pollution: oooooooooo
Plane pollution: OOOOOOOOOO OOOOOOOOOO OOOOOOOOOO OOOOOOOOOO OOOOOOOOOO OOOOOOOOOO OOOOOOOOOO OOOOOOOOOO OOOOOOOOOO OOOOOOOOOO
(bike pollution is slightly more than nil just because of the CO2 we breathe out while riding)
Speak for yourself, I bike with a bag on my head to capture my emissions.
Don't worry, your body will release all that carbon when you die.
What about the emissions from the other end?
Technically, the CO2 animals exhale is carbon neutral because it's from plants you eat (or your food eats). Unless you're eating petroleum derived products of course.
I say technically because while the plants themselves are carbon neutral, modern food production and distribution, especially meat production, still has a large carbon footprint. So your breath is only truly carbon neutral if you foraged for food in the forest on foot.
So once again: return to monkee
I didn't come here to be judged
Don't forget that many small propeller driven aircraft run on leaded gas, and it's a formulation of leaded gas that has 10x the lead that motor fuel used to.
But, didn't you hear the Midgley guy who invented TEL like 100 years ago? You can safely breathe it and even wash your hands in it! (said right after he got lead poisoning)
Then he went on to make Freon.
"Most dangerous man in history"... and knowing humanity's track record, that's something.
Worth noting that the amount of aviation fuel burned annually should make it a negligible contributer to environmental lead contamination compared to widespread automotive use (although I'm sure it contributes on airport grounds).
Edit: All the pilots I know want to use unleaded, and it was recently approved after being stuck in a bureaucratic nightmare process, but market forces may make it hard to adopt.
Small aircraft have a carbon equivalent to large cars. My plane is from 1961 and has a fuel economy of 15mpg as the crow flies (arguably closer to 25mpg because of straight line measurements versus winding roads that can almost double the distance), seats 4 people comfortably, and flies at 160 mph.
Hmm, interesting. I had the opposite impression. Maybe from discussion of private jets? I wonder how commercial jets vs. private jets vs. light aircraft fare -- similar to cars vs. buses, perhaps? I haven't actually dug much into this subject :\
Just looked some up, they're approximately, per passenger:
The more passengers, the more efficient.
So, fully loaded, there isn't that much difference between a private jet, a limo, a car, light aircraft, ultralight, motorbike, train, or low range commercial jet.
But if it's a single person, a private jet would use 10 times more fuel than a motorbike.
A fully loaded bus, still wins hands down.
It's probably plane with propeller, not jet engine
Is leaded gas still a requirement, or have they found a way around that by now for old prop planes?
It was caught in FAA-Bureauctatic hell for 15+ years and just approved last year. It will be still be slow to become available and adopt for reasons that are complicated, but amount to bureaucracy, economics, and an insane degree of risk aversion. The vast majority of pilots want unleaded and it's also much better for the engines.
Breathing isn't pollution
Depends who
But some people are a waste of oxygen
They don't cycle
Walking pollution: ...
That's right, bike pollution is less than walking (or running) pollution in terms of CO2 per mile travelled. Cycling typically burns ~⅓ of the calories compared to making the same journey on foot and there's a direct link between calories burnt and CO2 produced.
Cycling at 12mph takes roughly the same energy as walking at 4mph. You emit the same CO2 per minute, but get there in ⅓ of the time. Running at 12mph takes 3 times the effort of cycling at 12mph. You'll get there in the same amount of time, but breath out 3 times as much CO2. Bicycles are more efficient than our own two legs - how cool is that!
I gave up flying to have kids. Probably worse for pollution
I've got to ask, though—how is breathing CO2 pollution? Aren't we just taking in air, removing the oxygen, and exhaling the waste gases? Isn't there the same net CO2 afterwards?
Have I misunderstood something as simple as breathing? Please say no.
You haven't misunderstood it! You're just coupling cellular respiration with photosynthesis, which on the surface seems to balance to net zero -- 6 CO2 molecules and sunlight create 1 glucose molecule, and we break down 1 glucose molecule for energy and generate 6 CO2 molecules.
There's one big factor though which isn't immediately obvious, and that's the rate of reaction. The chemical equations say nothing about how many molecules are consumed per second. In order for the net CO2 to be zero, they'd need to consume and generate CO2, respectively, at the same rate, which isn't the case.
It's actually a really good thing, because photosynthesis happens faster. Plants are net negative CO2 because of that. What we'd need to complete this comparison now is how much CO2 a human generates by existing, and we can determine how many plants are needed per human to have the same net CO2.
Thank you! What a great explanation. I'm always amazed by how much cooler things are than I expect.
Please accept this lemmygold: 🥇
Try reading that comment with a TTS engine. Lol
here
oof. Apologies!
This made me giggle
I feel like it should be .. for the amount of gas I release while cycling.
But, do that people have light aircrafts or motherfucking Boeings 787?
Planes still require leaded gasoline and they are the largest contributor or airborne lead pollution in the US, probably the world.
as if rich people care about how much they pollute
Cycling has carbon emissions if you factor the additional calorie intake needed to power your bike. :| Which will vary widely depending on your size, diet, and food source. Is it still a more sustainable form of transportation? Probably, but maybe not in extreme cases (like a 300-lb person eating beef daily flown in from the other side of the planet, versus, a tiny two seater electric car power off of solar energy, using batteries sourced from recycled materials) and it certainly isn't 0 impact.
Also, for extra pedantism, carbon emission are not pollution (in the sense that it doesn't poison the life forms directly), but it is a GHG which causes harm to the environment too.
If you factor calorie intake of the bike rider you need to do the same for other forms of transportation. And if you account for the amount of exercise people are supposed to get to stay healthy there's no additional calorie intake whatsoever.