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 19 hours ago by [email protected] to c/[email protected]
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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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[–] [email protected] 1 points 16 hours ago

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.