this post was submitted on 20 May 2024
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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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Giant Hail Is the Weather Threat Keeping Insurers Up at Night (www.bloomberg.com)
submitted 6 months ago by silence7 to c/climate
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As the climate has warmed, there’s been an increase in the ingredients that make up hail storms: more instability in the atmosphere and stronger updrafts. The altitude in the atmosphere where water freezes has also been rising because of the warmer weather. This means that small hailstones often melt before they hit the ground. The upshot, said Gensini, is the hail that hits will be bigger and storms that produce small stones will be less frequent, thanks to climate change.

Yet even if warming’s effect on hail globally is still emerging, there are clear climate signals in specific places, namely Europe, according to Ian Giammanco, lead research meteorologist and managing director of standards and analytics at the Insurance Institute for Business & Home Safety (IBHS), an industry-funded research group. “The hail across northern Italy, France and that sort of belt is increasing at an anomalously high rate,” he said.

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[–] SchmidtGenetics@lemmy.world 9 points 6 months ago (2 children)

It’s interesting that they don’t talk about seeding the clouds at all.

Where I live they (the insurance companies pay for it) seed the clouds with silver iodide to create more nucleation points for the hail. This will increase the amount of hail, but decreases to total possible size.

[–] silence7 11 points 6 months ago (1 children)

Probably because if you do that, you're on the hook for damage to properties your company didn't underwrite policies for.

[–] SchmidtGenetics@lemmy.world 3 points 6 months ago* (last edited 6 months ago)

Works here, I think all the insurance agencies pay into the program.

But what would you sue them for? The storm was happening and it also doesn’t always work, it mitigates their potential payouts for claims that are already going to happen.

Think golf ball sized instead of baseball, stuff is still getting damaged.

[–] thisfro 4 points 6 months ago (1 children)

It is unclear if seeding actually has a large enough impact on hail formation.

[–] SchmidtGenetics@lemmy.world 3 points 6 months ago* (last edited 6 months ago) (1 children)

Insurance companies aren’t known to just spend money for no reason, it’s adding nucleation points, with less nucleation points the hail can build up larger before it break out of the storm cloud.

Sure they can’t prove it’s doing anything, but more nucleation points can’t make things worse and they know more nucleation points mean smaller potential hail.

It’s usually politics at play or environmentalists screaming about chemicals in the clouds that are the hurdles for something like this.

[–] thisfro 3 points 6 months ago

One of the biggest problems in research is that there is no control: We don't know what would have happend without the seeding. So we can only compare random storms that are seeded and not. Here the differences are very small (i.e. statistically insignificant). But that doesn't mean it has no effect.

Also I think we should be careful when using such things at large scale, as we just don't know the outcome. In small quantities it is however no hazard at all.