this post was submitted on 21 Feb 2025
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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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Stand-off between airlines and oil groups threatens net zero flying | Sustainable air fuel market stalls as airlines want lower prices while oil groups reluctant to produce without long-term orders (www.ft.com)
submitted 1 day ago by silence7@slrpnk.net to c/climate@slrpnk.net
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The basic problem is that "sustainable" aviation fuels, if based on biofuels, would substantially compete with food production. This limits their scale pretty significantly, so they can't easily scale up to the levels that the airline industry wants, which means that the cost will remain quite high.

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[โ€“] photon_echo@slrpnk.net 1 points 23 hours ago (1 children)

That is a very important question. SAF is a name for a bunch of different fuels produced from sustainable sources. I posted a larger reply to the main article that details some of the input feedstocks which answers your question here.

[โ€“] veganpizza69@lemmy.vg 1 points 4 hours ago

And I posted a different comment here: https://slrpnk.net/post/18679785/13966072

You're not getting the fact that those feedstocks have their own feedstocks.

Using waste is also misleading, the goal needs to be to reduce waste, not make the waste a co-product. Cooking oil waste isn't something that's going to be some reliable feedstock either. In the context of economic "drama", you can expect restaurants to close down much more or to reuse that oil a lot more times. Even too much: https://en.wikipedia.org/wiki/Gutter_oil The biodiesel processors won't be able to rely on that source, there's going to be a growing need for the virgin feedstocks.

Your position is essentially the same one as the meat and dairy industries, who are the competitor for that ~~feedstock~~ feed. That includes 'waste'.