this post was submitted on 26 Nov 2023
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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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Energy minister says hydrogen will 'not play a major role' in heating homes in the UK (news.sky.com)
submitted 11 months ago by [email protected] to c/[email protected]
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[–] [email protected] 4 points 11 months ago (1 children)

Because it is not as difficult as you think it is. A lot of gas infrastructure can be converted to use hydrogen and we have the technology to handle hydrogen. That basicly means new seals and pumps for pipelines and some storage sites can be converted as well. With that you get a massive storage site. Even more importantly a lot of chemical processes use hydrogen and some steel production processes as well.

The problem is that hydrogen is going to be more expensive then electricity and electrolysis units are very expensive today. So if you can electrify something it propably is smarter to do that then to use hydrogen.

[–] [email protected] 1 points 11 months ago (1 children)

I thought the issue with hydrogen is that it is literally small enough in gas form to just pass through materials used in existing infra.
And storing it in liquid form is very difficult (ie, have to keep it cold, as the high pressure will just force the gaseous hydrogen through the tank/pipe walls).

I wouldn't be comfortable with the thought of wall/roof cavities filling up with hydrogen.

Did a gig a while ago that ran on hydrogen generators as a publicity stunt.
There was a 10m exclusion zone around the fuel tanks.
I presume that was just "new tech? hyper health&safety".

[–] [email protected] 3 points 11 months ago (1 children)

A lot of the gas infrastructure was originally built for coal gas and that has a high hydrogen content. Standards have often been kept and so a lot of infrastructure is able to handle it.

https://en.wikipedia.org/wiki/Coal_gas

[–] [email protected] 1 points 11 months ago (1 children)

Did it have high hydrogen? Or was it hydrocarbons rich in hydrogen?

[–] [email protected] 3 points 11 months ago

Hydrogen gas. The basic reaction is something like:

3C (i.e., coal) + O2 + H2O → H2 + 3CO

It depends on the process thou and it is usually not super clean.