this post was submitted on 15 Nov 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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Trump wants to ‘Drill, baby, drill.’ What does that mean for climate concerns? (alaskapublic.org)
submitted 5 days ago by Midnight@slrpnk.net to c/climate@slrpnk.net
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[–] eleitl@lemm.ee 3 points 5 days ago (2 children)

Solar and wind are only relatively cheap if you don't need to buffer. Unfortunately, you do. And electricity production is only a fraction of primary energy use. Concrete, steel, glass, fertilizer, chemistry, diesel and bunker fuel for shipping and mining. Can't make new renewable infrastructure without fossil extraction.

[–] sonori 7 points 5 days ago

With current battery and hydro storage prices, their cheaper than natural gas with with the cost of the buffer, and absurdly cheap for any industrial application that doesn’t.

Also there are bulk industrial processes to make steel, concrete, fertilizer, and glass with little to no carbon emissions, they just require more electricity and so aren’t cost effective if your electricity comes from fossil fuels, hence why most such plants only started construction once the cost for electricity in general dropped below the cost for fossil electricity.

Moreover while mining and shipping are only starting decarbonization, the required fossil fuel extraction is already far, far smaller than what’s continually required to run the generation they are replacing, and that’s only going to continue to drop as more and more primary energy is electrified with renewables.

[–] futatorius@lemm.ee 3 points 4 days ago (1 children)

About half of the fuel used in shipping is to move fossil fuel from one place to another.

[–] eleitl@lemm.ee 1 points 4 days ago

Some ways are more efficient than the others https://maritime-executive.com/article/barge-transport-wins-on-fuel-efficiency

Electric batteries have a low energy density but overall higher efficiency than diesel. Fuel cells with liquid synfuels like methanol have similiar energy density (about half) and twice or more the efficiency of diesel.