this post was submitted on 25 Oct 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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Key to H2 economy: Toyota portable H2 cartridge (www.hydrogenfuelnews.com)
submitted 2 weeks ago by humanspiral@lemmy.ca to c/climate@slrpnk.net
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cross-posted from: https://lemmy.ca/post/31642688

for capacity: https://insideevs.com/news/738124/toyota-portable-hydrogen-cartridge-fcev/#:~:text=Gallery%3A%20Toyota%20Portable%20Hydrogen%20Cartridges&text=Toyota%20didn't%20say%20how,of%20161%20grams%20of%20hydrogen.

161grams = 5kwh+ of heat energy or close to 3kwh of electric only energy in a fuel cell.

For drones, ebikes, powerstations, this would be higher electric weight density than batteries. And solves ebike/powerstation charging on the go problem.

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[โ€“] federalreverse@feddit.org 2 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

Green electricity is both cheaper and much more available. Green H2 is inherently at a price disadvantage compared to green electricity. Unless absolutely unavoidable (as with steel or fertilizer production), why would you use it for anything?

Maybe I am looking at this from too much of a European perspective, i.e. on average, the grid is stronger here than e.g. in the US -- but I don't see going off-grid as a major factor either. If you can, you generally avoid going off-grid intentionally, because it's just extremely expensive. Even if you're planning for natural disasters, I see going with grid-connected, off-grid-capable solar as a much better idea, at least for most of the year.

[โ€“] humanspiral@lemmy.ca 1 points 2 weeks ago

Green H2 is inherently at a price disadvantage compared to green electricity.

Intermittent renewables are the cheapest. If you can consume electricity directly while it is produce, that is at cheapest rates. Batteries is one intermediate to get good power charge/discharge rates to absorb, even cheaper, surplus electricity that supports more renewables. H2 electrolysis is a way to absorb renewable production that would exceed 24 hour demand on some days, and allows for more renewables and batteries to keep the energy/batteries productive/monetized all of the time.

Even trucks and ships have a cost advantage in distributing H2 energy compared to electric wires. Pipelines even more. H2 distribution doubles as storage as well.

H2 is a few years ahead on horizon. Lowest hanging fruit is gasoline/diesel replacement, but alternative to electric grid expansion is real, with offshore wind the biggest gainer of going pure H2 electrolysis, and land based renewables expanding their footprints to have alternate sales options than an electric monopoly.