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] 5 points 9 months ago (1 children)

I just did a quick of my statistics. My bike typically provides an average of 100W in my hilly 28km commute (both ways) that takes about 1h15 minutes. That's less than 5Wh/km.

I'm using a fairly high setting, too, and judging by the fact that I don't break a sweat at all, I'm 100% sure I'm not pedaling as hard as I do on a regular bike.

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

If my calculations are right, at that speed with the numbers from the graph, that would put the energy requirement at about 10 kWh/km. That means that with your motor delivering half of that, the human output actually matches up pretty well with the graph. I’m saying output, because I’m convinced that the graph doesn’t take the calories being burned into account and only shows the work being done to move the bicycle.