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399 points gmays | 1 comments | | HN request time: 0.001s | source
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oezi ◴[] No.42166179[source]
Looking into the numbers a couple if months ago I was surprised how little it costs to stop climate change.

On the order of 100-200 trillion USD. Which is roughly 100-200% of global yearly GDP. Or 2-5% of yearly GDP until 2050. This could well be provided by printing money at all the federal reserve banks.

This investment will likely bring in a positive return on investment because it reduces the negative climate impacts.

Without such investments the downstream costs in climate change adaptation will be very expensive

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ein0p ◴[] No.42166244[source]
And the question is, then, what if you spend all those trillions (which we don't have, BTW), and it doesn't "stop". Who's going to be responsible, and in what way?
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not_kurt_godel ◴[] No.42166293[source]
Then we'll only have just eliminated air pollution that kills millions of people per year and established independent energy security
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xyzzy4747 ◴[] No.42166557[source]
Air pollution and CO2 emissions are different things. One causes cancer and heart issues, the other causes global warming.

Large amounts of particulate in the air (for example from a volcano) would probably cause global cooling since it blocks out the sun.

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1. johnfernow ◴[] No.42166919[source]
What you're saying is correct, but I can't think of many scenarios where it's relevant to human actions in the present, with the exception of freight ships' sulfur emissions. [1]

For the most part, burning fossil fuels is leading to both air pollution and GHG emissions. Sometimes you can in theory choose an option that leads to less global warming than the status quo but is worse for human health (e.g. burning biomass for energy instead of natural gas, or using diesel instead of gasoline engines), but usually there's an another option where you can reduce both undesirable outcomes (wind, solar, hydro or nuclear energy, electric vehicles, etc.)

Even from an economic standpoint I can't think of too many scenarios where clean energy isn't the better option long-term. An EV will have a higher up-front cost but definitely will be cheaper than a diesel vehicle across it's lifetime, and most areas I imagine solar or wind would be cheaper than biomass. Freight ships are the only thing in 2024 where I think we don't have an option that's better in both regards and cheaper -- there we do have to choose between more global warming or more particulate matter harmful for human health. But I think that's the exception more than the rule for human activities.

1. https://www.scientificamerican.com/article/cleaned-up-shippi...