Was looking into this because of that recent Paul McCartney article that was shared, and wanted to share what I found:
Here’s a good breakdown of differences between vegan & vegetarian diets in terms of climate impact: https://www.nature.com/articles/s43016-023-00795-w
Emissions:
Vegan:............. CO2: 2.16, CH4: 04.39, N2O: 0.71Vegetarian:........ CO2: 3.33, CH4: 20.21, N2O: 0.98medium meat-eaters: CO2: 5.34, CH4: 40.88, N20: 1.73high meat-eaters:.. CO2: 7.28, CH4: 65.40, N2O: 2.62
So vegans have 30% of the emissions as high-meat-eaters, and the differences between vegans and vegetarians are significant with regards to their emissions, particularly methane emissions due to the significantly higher consumption of cheese by vegetarians.
(EDIT: it has been suggested it’s worth clarifying that vegan diet having 30% CO2 emissions means that there was a 70% reduction in CO2 emissions, and that methane emissions were reduced by 93% going from high-meat to vegan.)
Vegetarians ate significantly more cheese (30 g / day) than even meat-eaters (19 g / day), despite eating less dairy overall otherwise.
Also should be noted that there is a big gap between biodiversity impact between vegans and vegetarians, with vegetarian diets causing nearly double the number of species extinctions per day than vegan diets.
I was surprised that water use was so similar between vegans and vegetarians considering how much cheese vegetarians eat.
I still would recommend a vegetarian diet to meat eaters, as it’s still a massive improvement (and in my experience, it’s easier to become vegan once vegetarian), just thought it was interesting to actually quantify differences between veganism and vegetarianism in terms of climate impact.


There’s an element that always misses from these assessments for some reason. Fishing. Mass fishing is one of the greatest destructions to the environment. And the oceans account for around 72% of the world’s oxigen production and nothing on land or everything on it combined achieves as much carbon capture as the oceans do.
And we’re destroying them at a faster rate than we are doing to anything on land.
I would suggest that instead of getting too bogged down in statistical data which will always have a lot of distorted information through how averages are obtained, people should learn how energy is exchanged through the trophic levels. Learn how biomagnification inflates every issue, from accumulation of toxins and chemicals, to energy loss and waste. The larger the animal, the larger the inefficiency as a redundancy, if I may. This logic can also be applied to Flora, not just Fauna. Ideally we should generate most of our sustenance through the lowest trophic level possible. The microbial and bacterial one. That would be where Precision Fermentation can play a great part in our futures.
But starting with understanding how predation systems were formed in Fauna is a great way to understand the trophic balance. It didn’t start by having carnivores first, did it? What would they consume? Flora? The fact is that having ambulant organisms which could evade many circumstances and weather events allowed them to reproduce beyond what the local Flora could allow them to consume, which resulted in them having to start preying on each other as result of induced scarcity.
Lack of self-regulation is the overarching flaw in the design. Once Fauna emerged, the rate of extinctions of both Flora and subsequently Fauna accelerated drastically, and so did changes in climate, obviously.
This is why I agree with the people who criticise Darwin for the use of the word “Evolution” as a descriptor in his thesis. It suggests “betterment” or “improvement”. Which from the insurgency of Fauna alone, we can attest that the world did not improve from it. Regarding sustainability alone, quite the contrary. “Transformation” is more accurate to describe what is always occurring. Mutations and subsequent adaptations transform the world. As if that constitutes Evolution… well… a problem can also evolve, I suppose.
Entropy, I guess…
Chaos is the architect of the scavenger’s rule of the wild.
There’s no hierarchies in Nature. The trophic levels merely refer to energy source in the chain - well, a tridimensional Web would be a more accurate visual discription than a chain.
But it would also make the microscopic forms of life the most valuable, if one wanted to place value to establish hierarchy. Which would be a silly endeavour to begin with. But a less silly one than a top as figment with a lion standing there. There is no top. Everything stems from the center and returns to it eventually.
But we as a species are nothing but a continuation of that fundamental flaw. We can’t achieve self-regulation, and ultimately we will cause resource collapse, which will cause scarcity, which will cause humans to prey on each other. This is our design. Or the inherent flaw in our design, like in all Fauna. One we’ve repeated incessantly through our brief recorded account we call history.
We just never did it at this rate and or everywhere all at once.
Now, how do we achieve self-regulation as a species? Theoretically it is possible, but in practice we can’t seem to get there.
We always get to the “tragedy of the commons”. Read up on this if you haven’t. It’s the feedback loop in our behaviour that makes us always race to the bottom basically.
As to your post, if you allow me to suggest, it would make more sense in one of the several environmental communities or even the solar punk ones across the lemmyverse.
Veganism as a word has lost all meaning by this point, but it is supposed to merely be a consideration for sentience when reduced to its’ most basic construction.
I don’t believe in the existence of consciousness. As it stands it merely seems to be meta-cognition, at least everytime someone tries to describe it. But cognition stems directly from sentience. Which stems from the sensorial experience. Which is verifiable. And why we can’t quite place it with the animals in the bivalve category. It’s too rudimentary beyond the management of those two valves.
But I’ll leave on this note, regarding sentience…
I have congenital anosmia, which means I’ve never smelled. If I were to try to think of a smell, it would be like trying to picture a colour I’ve never seen. Which led me to a thought experiment quite a while back in my life…
If a baby was born with nervous damage and never possessed any single one of the five senses, and if we kept this child alive… how could this baby have a single thought be formed? Out of what?
This is why I don’t believe in consciousness. We are nothing but an input-output system. And choice does exist somewhere in there. I just don’t call it “Free Will”. Too many things wrong with both of those words alone and even more when put together to describe what we’re trying to describe. The subatomic reality doesn’t suggest a predeterministic model. We, at our core, are as what reality seems to be, a randomising procedure. Another agent of chaos in the seemingly eternal entropy that is the universe. Let us just not call that free, when everything exists in condition to everything.
Anyway… when I write such long comments (which is too damn often!!), I never know how to finish. I always feel like apologising. So… sorry for the long one.
And if you read this far, I thank you for the attention you’ve given this fool.