this post was submitted on 05 Aug 2024
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Climate - truthful information about climate, related activism and politics.

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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.

Recommended actions to cut greenhouse gas emissions in the near future:

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[–] [email protected] 2 points 4 months ago

Heavy metals are present in the soil/water in many regions. It's often a natural accumulation. For example the arid production zones in California and Arizona were highly contaminated naturally (and salty). When they started irrigating the land they deep plowed it to breakup the caliche layers. They then continuously flooded it to push the salt and water soluable heavy metals lower in the soil profile. Much of it ended up in the groundwater.

Some heavy metals like lead and arsenic were used as pesticides for almost 90 years. Most productions zones were contaminated during this period. Of course once you apply them, they don't disappear.

At this point, pretty much all production areas are contaminated to some degree. We have no good way to remediate the issue in the soil. So regulators focus on limiting the contamination from controllable sources.