this post was submitted on 09 Jul 2024
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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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Can we air condition our way out of extreme heat? part 1: a primer on air conditioning (www.theclimatebrink.com)
submitted 4 months ago by silence7 to c/climate
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[–] 14th_cylon@lemm.ee 4 points 4 months ago* (last edited 4 months ago) (2 children)

Plus the extra emissions from dirty power plants to power all of the A/C

i mean if we had AC that would work with 100% efficiency, then it would be the prime use case for solar panels. you only need AC when there is a lot of sunlight and vice versa.

[–] HobbitFoot@thelemmy.club 2 points 4 months ago (1 children)

Technically, all heat pumps have greater than 100% efficiency. It is how electric heat pump heating can compete with natural gas heating in terms of efficiency.

[–] brisk@aussie.zone 1 points 4 months ago

They have a greater than 100% Coefficient of Performance, which is often marketed as efficiency in heat pumps. Their efficiency is bounded between 0 and 1 like every other physical system.

[–] ptz@dubvee.org 1 points 4 months ago (2 children)

I don't think we'll ever make any machine that's 100% efficient (electric resistance space heaters aside), but maximizing the efficiencies we can will at least mitigate most of the problems if they're powered by clean energy.

Not sure if ground source heat pumps (which would heat the ground rather than the air in the summer in AC mode) would make a meaningful difference or not.

[–] mojofrododojo@lemmy.world 3 points 4 months ago

Not sure if ground source heat pumps (which would heat the ground rather than the air in the summer in AC mode) would make a meaningful difference or not.

I worry that this will just displace the problem for a generation, and eventually, just as the atlantic ocean has warmed to fucking jacuzzi levels, eventually we won't be able to pour more heat into the ground.

https://apnews.com/article/record-hot-water-florida-coral-climate-change-6414d44c6f120507d3ee37c059fb75cd

[–] 14th_cylon@lemm.ee 2 points 4 months ago (1 children)

I don’t think we’ll ever make any machine that’s 100% efficient

i didn't mean to imply that, it was purely theoretical remark

[–] ptz@dubvee.org 2 points 4 months ago

Yea, I got that :) just building on it.