this post was submitted on 22 Dec 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.

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

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‘If 1.5m Germans have them there must be something in it’: how balcony solar is taking off (www.theguardian.com)
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Crosspost from https://beehaw.org/post/17685168

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[–] eleitl@lemm.ee 7 points 4 days ago* (last edited 4 days ago) (1 children)

On loss of power these inverters cut off within 20 ms or so. These are grid-tied, not insular (though with hacked firmware some of the models can be made insular-capable).

[–] barsoap@lemm.ee 4 points 4 days ago (1 children)

On loss of power these inverters cut off within 20 ms or so.

20ms are exactly 1/50th of a second i.e. our grid frequency I think there's some more leeway. A whole oscillation being gone surely is suspicious and you want to shut off but that might take another millisecond or two.

[–] eleitl@lemm.ee 3 points 4 days ago

It's not a hard realtime cutoff spec, more a relais native actuation time. And from the behaviour I've seen they are ramping up slowly over minutes when the mains power is back, which seems a sensible thing to do.