this post was submitted on 17 Dec 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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Food producers turn to greener fertilisers to reduce carbon footprints (archive.is)
submitted 11 months ago by GreyShuck@feddit.uk to c/climate
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From baguettes to beer, the world’s leading food and drinks makers are rushing to reduce their carbon footprint by tackling one of the hidden culprits of emissions in their value chains: fertilisers.

Ahead of disclosure rules for greenhouse emissions throughout their supply chains enacted next year, companies including PepsiCo, Heineken and Nestlé have turned to green fertiliser start-ups to help tackle emission levels.

Crop nutrients underpin production of half the world’s food but contribute significant CO₂ emissions at the same time. Fertilisers used for agricultural ingredients account for about 15 per cent of total emissions from beer supply chains and 35-40 per cent for bread, according to industry experts.

Nitrogen-based fertiliser and farm manure make up 5 per cent of global greenhouse gas emissions, producing 2.6bn tonnes of CO₂ a year, more than global aviation and shipping combined, according to research published by the journal Nature Food.

Original article.

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[–] sonori@beehaw.org 3 points 11 months ago

It’s worth noting that one of it not the the largest current uses for hydrogen is for producing ammonia nitrate fertilizers, and that’s currently done with methane steam reformation, which produces an massive amount of co2 compared to the hydrogen. Just getting that demand replaced with green hydrogen would be a massive reduction in co2.