this post was submitted on 18 Nov 2024
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How was the data shown in this graph aggregated? How do you measure CO2 emission 500 000 years back?
When ice forms, it traps small airpockets in it, so we take samples of ice from the polar circles kilometres deep, date it, crush it to release the air pockets and measure the air contents. Then we can see how different the CO2 amounts were to now.
Source: there's a fuck ton of different articles that talk about this, and this is the first one I found of Google, search yourself for more.
Its ice core data, this nature article describes it if you can access it somehow. "Air bubbles in ancient ice cores" is what NASA says
Maybe spend a few minutes googling this stuff because it's been answered many times over and it just looks like you're deliberately trying to poke holes in what is ultimately very well established scientific fact.
To give you a TLDR though it's ice cores. You look at the air trapped in ice cores, the deeper you drill the further back in time you go because the ice and therefore the air trapped inside is older.
Its a simple question about an unsourced graph. Don't you think you're being a bit too adversarial?
Not everyone is here pushing an agenda, some people use the comments to talk to other people.
Thought the same. Trivial questions are asked and answered all the time (more trivial than this one too, where the question to enter into Google isn't even that obvious). When it comes to politically loaded topics people always like to swing the downvote hammer.
And even if the question isn't being asked in good faith, just dismissing it might feel like you're showing them up, but someone who would be convinced by the bad faith question isn't going to change their mind when they see a "just Google it, it's so simple".
And even for those that do search it, who knows what sources they end up looking at. "Oh, 9/10 oil execs say it's actually ok while the 1/10 remaining just laugh when asked, so it must be ok! Oh and Fox News confirms it!" Buys another unnecessarily large truck.
To be honest, I probably am yes. Climate change as a political issue has been around for decades and there are many folks working hard to discredit the science so it's very easy to assume the worst when people ask these kinds of questions.
It's entirely possible that the commenter was being genuinely curious but those aren't the vibes I got, maybe I'm just too jaded though.