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)
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[–] CJOtheReal@ani.social 2 points 2 years ago (1 children)

Efficiency below 50% is pretty bad...

[–] Tosti@feddit.nl 3 points 2 years ago (1 children)

Jup.. but not using the energy ... So using this for excess electricity only.. and then using it for stuff like Steel production And other industrial processes does seem to have a function. But home heating.. I don't see it.

But the price of heat pumps needs to drop a lot to make them affordable for the mean of people.

[–] CJOtheReal@ani.social 1 points 2 years ago (1 children)

Using better and more efficient energy storages that don't just evaporate through tanks is better. There are more options than hydrogen.

Hydrogen is likely only being usable for Aircrafts because of the energy density, everything else is just inefficient.

Steel industry can use less energy by using electricity directly most industries can use electricity directly more efficiently.

And heat pumps are actually not that much more expensive than a new Gas heater.

[–] Tosti@feddit.nl 1 points 2 years ago

The hydrogen method allows for much higher peak temperatures when combined with arc furnaces, allowing for a lower peak consumption (on the short to medium term, peak consumption is an issue for the grids and mast be motivated).

In addition hydrogen can be used as a replacement for the coal in the manufacturing proces itself. I read that it should allow for 70-95% CO2 reduction in the manufacturing proces.l. I am sceptical about this number still but it would be a great step. This is in its infancy and only double the price of dirty steel currently. So the gap in price seems closable.