this post was submitted on 03 Mar 2024
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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 efficiency of active travel (walking, cycling, ebike) compared to an electric car (slrpnk.net)
submitted 9 months ago* (last edited 9 months ago) by [email protected] to c/[email protected]
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[–] [email protected] 15 points 9 months ago* (last edited 9 months ago) (3 children)

Now do one where you A) normalize this to the same trip distance (not speed, so that these choices for a single trip become meaningfull) and B) convert the kWh into CO2 emissions, including the emissions in growing and transporting the various power and food production methods used (coal to solar, locally produced veggies-air shipped beef)

[–] [email protected] 13 points 9 months ago* (last edited 9 months ago)

It's already normalized to distance, the graph is showing kWh/km. The speed is just there for additional context.

[–] [email protected] 2 points 9 months ago

Trip distance is dependent on methods of transportation at the aggregate level. That's only relevant for policy decisions or collective actions, not individuals of course, but if we are going to deal with climate change, collective action is necessary.

Given the graph is normalized by km traveled, its overly generous to cars.

[–] [email protected] 1 points 9 months ago

Yeah, if you account for the amount of CO2 that goes into producing food the ebike will be much more efficient in terms of co2/km than a regular bicycle. Even if you cheat by making the regular bicycle drive slower than the ebike, like they did for this chart.