this post was submitted on 16 Jan 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.

Recommended actions to cut greenhouse gas emissions in the near future:

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[–] Deebster@programming.dev 6 points 10 months ago* (last edited 10 months ago) (2 children)

Interesting/useful bits:

  • The term “climate change” was initially popularized by Republicans under G.W. Bush as they wanted a softer term that sounded less “frightening”. It's a better term though, because it covers non-temperature effects like ocean acidification.
  • A warmer atmosphere means more water can be held in the air, which leads to more rain (often more extreme) but also more droughts as warmer air can remove more water from an area.
  • The fact that the climate has (slowly) changed in the past doesn't mean we aren't causing change now. The faulty logic is akin to People have died of cancer in the past; therefore, cigarettes don’t cause cancer now.
  • NOAA projects 3.5 feet to 7 feet sea-level rise along America’s coastlines by 2100.
  • Unsurprisingly, windmills aren't driving whales “a little batty”. Also, wind farms are responsible for just 0.03% of all human-related bird deaths in the U.S. and onshore wind is one of the cheapest ways to generate electricity.
  • The primary reason the US Army wants to electrify its fighting vehicles is to reduce wartime casualties (no need for refuelling missions and electric is stealthier due to being quieter and cooler).
[–] silence7@slrpnk.net 4 points 10 months ago

That's a pretty good summary.

A couple more details:

"Global warming" and "climate change" had both been used to describe the same phenomenon of temperature increases at similar rates well before the Republican memo advocating for choosing only one:

And once the memo came out, and people ridiculed the Republicans for it, they had talk-radio hosts claim the Democrats were responsible for a name change for the next decade or so, causing much public confusion.

[–] jadero@slrpnk.net 3 points 10 months ago

That NOAA projection made me question what "sea level" even means if "sea level rise" can vary so much regionally. The extreme high end of the range (Gulf coast) is 18". The extreme low end (Carribean) is 6": 12" difference over about 2500 miles.

I did a shallow dive into sea level and learned that a variety of factors go into the calculation of sea level. Those factors have enough regional variability to mean that sea level is, in fact, a regional phenomenon.

The best explanation I found comes from NASA: https://climate.nasa.gov/explore/ask-nasa-climate/2990/sea-level-101-what-determines-the-level-of-the-sea/