this post was submitted on 08 Feb 2026
36 points (95.0% liked)

Bicycling

3224 readers
1 users here now

A community for those who enjoy bicycling for any reason— utility, recreation, sport, or whatever!

Post your questions, experiences, knowledge, pictures, news, links, and (civil) rants.

Rules (to be added on an as-needed basis)

  1. Comments and posts should be respectful and productive.
  2. No ads or commercial spam, including linking to your own monetized content.
  3. Linked content should be as unburdened by ads and trackers as possible.

Welcome!

founded 2 years ago
MODERATORS
wolfeh@lemmy.world
36
Reverse traffic pyramid (mastodon.green)
submitted 1 week ago* (last edited 1 week ago) by mapto@feddit.bg to c/bicycling@lemmy.world
17 comments fedilink hide all child comments
 

За да подобрим живота в нашите градове, тези приоритети трябва да бъдат управлявани.

you are viewing a single comment's thread
view the rest of the comments
[–] mech@feddit.org 1 points 6 days ago* (last edited 6 days ago) (1 children)

If they share 35 cars, yes.
If they each drive their own cars, no, it's close, and depends on what cars they drive.

[–] atzanteol@sh.itjust.works 1 points 6 days ago* (last edited 6 days ago) (1 children)

Shared rides is a step above on the pyramid.

From what I can tell it's not really close. At least for "average cars" and "typical commercial airlines".

https://en.wikipedia.org/wiki/Fuel_economy_in_aircraft

[–] mech@feddit.org 1 points 6 days ago* (last edited 6 days ago) (1 children)

this represents 28 g of fuel per kilometer, or a 3.5 L/100 km (67 mpg‑US) fuel consumption per passenger, on average.

Now take into account that CO2 released at altitude is twice as bad as on the ground, since it absorbs all sunlight before part of it gets filtered out by the atmosphere or reflected by clouds.

[–] atzanteol@sh.itjust.works 2 points 6 days ago* (last edited 6 days ago) (1 children)

I hardly think that's relevant. CO2 doesn't stay where it was released.

The concentration of carbon dioxide in the mid-troposphere lags the concentration found at Earth's surface as mixing from the lower to upper altitudes usually takes days to weeks.

https://airs.jpl.nasa.gov/resources/107/concentration-of-atmospheric-carbon-dioxide-from-earths-mid-troposphere-2002-to-2013/

We're talking about yearly averages and decades of warming. Days to weeks is very short by comparison.

[–] mech@feddit.org 2 points 6 days ago

You're right, I misremembered. It's not the CO2 that has a higher effect when released at altitude than on the ground.
It's Nitrogen Oxides, water vapor and soot.

"In 1999, the IPCC estimated aviation's radiative forcing in 1992 to be 2.7 (2 to 4) times that of CO2 alone − excluding the potential effect of cirrus cloud enhancement.[6] This was updated for 2000, with aviation's radiative forcing estimated at 47.8 mW/m2, 1.9 times the effect of CO2 emissions alone, 25.3 mW/m2.[7]"

https://en.wikipedia.org/wiki/Environmental_impact_of_aviation#Factors