this post was submitted on 16 Apr 2024
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Climate - truthful information about climate, related activism and politics.

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Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.

As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades: Graph of temperature as observed with significant warming, and simulated without added greenhouse gases and other anthropogentic changes, which shows no significant warming

How much each change to the atmosphere has warmed the world: IPCC AR6 Figure 2 - Thee bar charts: first chart: how much each gas has warmed the world.  About 1C of total warming.  Second chart:  about 1.5C of total warming from well-mixed greenhouse gases, offset by 0.4C of cooling from aerosols and negligible influence from changes to solar output, volcanoes, and internal variability.  Third chart: about 1.25C of warming from CO2, 0.5C from methane, and a bunch more in small quantities from other gases.  About 0.5C of cooling with large error bars from SO2.

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[–] spud@sh.itjust.works 2 points 7 months ago (2 children)

they take a myopic view of the inputs and outputs for food sources, not considering, for instance, that much of what is fed to animals would otherwise be wasted. the beef doesn't produce all that CO2, poore & nemecek were calculating all the co2 that goes into the inputs. i mentioned elsewhere cottonseed, but frankly i know that only takes up a minute portion of what they're calculating. instead, they are also counting soy, and that's almost as dishonest as you can get. nearly all soy is pressed for oil, and after that, the waste product is what is fed to cattle and other livestock. technically, you could eat it, but most people don't and don't want to. feeding it to livestock actually reclaims waste products. and even the calculation for the soy itself is skewed since it often also counts the deforestation that has already taken place as an emission source, regardless of whether that particular plot of land has been deforested for decades.

[–] Maggoty@lemmy.world 1 points 7 months ago

Yeah that seems like it's pretty flawed. Even just going down the soybean oil byproduct rabbit hole the Internet says most of it is "acidulated" to prepare it as an ingredient in lubricants and plastic. So beef production isn't even the main use of the byproduct.

Do we have any better studies? Or is this like the infamous self defense with a handgun study, bad science and all we have at the same time?

[–] ulterno@lemmy.kde.social 0 points 7 months ago (2 children)

I was surprised to see 0.34 Kg or CO~2~ per Kg of Potatoes, but now that I read this, it makes sense.
They are taking many other things into account.

[–] Skua@kbin.social 1 points 7 months ago

I'm afraid they're straight up lying. The paper doesn't mention cotton even once. See for yourself in the paper here or the database here. It doesn't even specify one type of feed for the beef cattle, because it is a meta-analsyis of hundreds of others papers about specific practices in specific areas. It takes a weighted average of those depending on how much of the world's production the area studied in each one accounts for.

[–] spud@sh.itjust.works 1 points 7 months ago

I didn't lie at all: the other user doesn't seem to know how poore and nemeceks lcas are calculated in the first place