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Entirely unashamed anti car propaganda, and the more the better.

Unless the cyclists dinner has been buried deep in the earth for hundreds of millions of years it doesn’t matter.

Surely a cyclist is using more calories and consequently eating more than a driver, and that food requires fossil fuels to produce and transport.
 
Wasn't that calculation made on the basis of the cyclist eating nothing but free range beef etc.?

This is the original claim:

"The supposed dangers of manmade global warming from excess carbon dioxide (CO2) generation is often used as an argument for junking new road construction projects and otherwise discouraging car use. But in Europe someone has actually done the calculations!

Bicycles: 4 adults cycle 5 miles to work at an average speed of 8mph, time taken 38 mins (0.63hr).Exercise breathing rate: 6 cub metres/hour, so cyclists exhale 4 x 6 x 0.63 = 15.1 cub metres air.

Exhaled air contains 4% carbon dioxide (CO2), 1 cubic metre exhaled air contains 73.3g CO2. So the amount of CO2 exhaled by the four cyclists is 15.1 x 73.3 = 1108 g.

Car: Four adults travel by car, travelling 5 miles at average 22mph, time taken14 mins (0.23hour). At-rest adult breathing rate is 0.4 cub
metres/ hour. So four adults in car exhale 4 x 0.4 x 0.23 cubic metres air = 0.37 cub metres air. 0.37 cubic metres exhaled air, 4% CO2, contains 0.37 x 73.3 = 27g CO2. The car exhaust emits 215g CO2 per mile (modern, high mpg), so CO2 emitted is 5 x 215 =1075g. Total CO2 emitted by car and 4 seated adults is 1075 + 27 = 1102g. (from Bernard Abrams)

No difference! Those sweaty people on bicycles emit as much CO2 into the air as a car."
 
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This is the original claim:

"The supposed dangers of manmade global warming from excess carbon dioxide (CO2) generation is often used as an argument for junking new road construction projects and otherwise discouraging car use. But in Europe someone has actually done the calculations!

Bicycles: 4 adults cycle 5 miles to work at an average speed of 8mph, time taken 38 mins (0.63hr).Exercise breathing rate: 6 cub metres/hour, so cyclists exhale 4 x 6 x 0.63 = 15.1 cub metres air.

Exhaled air contains 4% carbon dioxide (CO2), 1 cubic metre exhaled air contains 73.3g CO2. So the amount of CO2 exhaled by the four cyclists is 15.1 x 73.3 = 1108 g.

Car: Four adults travel by car, travelling 5 miles at average 22mph, time taken14 mins (0.23hour). At-rest adult breathing rate is 0.4 cub
metres/ hour. So four adults in car exhale 4 x 0.4 x 0.23 cubic metres air = 0.37 cub metres air. 0.37 cubic metres exhaled air, 4% CO2, contains 0.37 x 73.3 = 27g CO2. The car exhaust emits 215g CO2 per mile (modern, high mpg), so CO2 emitted is 5 x 215 =1075g. Total CO2 emitted by car and 4 seated adults is 1075 + 27 = 1102g. (from Bernard Abrams)

No difference! Those sweaty people on bicycles emit as much CO2 into the air as a car."
Average speed of 8mph for the bike? Lol, no.
 
Indeed. That average speed would suggest that cyclists actually stop for traffic lights and respect regulations governing one-way streets or cycling on pavements in their journeys.
Again, lol. I ride on the roads, and stop at all lights. The simple truth is that is city traffic I’m just way, way faster than any car.
 
I see it daily because I look at the traffic light not the pedestrian crossing but Google it if you don't believe me.
so how many cars a day do you see jumping red lights? 1? 5? 10? 50? i'm talking about traffic lights, not about pedestrian crossings for the obvious reason that that's what people jumping red lights jump
 
Eh? Do you even know what a pedestrian crossing is?
yes. just to make it plain to you i'm talking about cars going through lights that for them are red, not them going through lights that for pedestrians are red, whether these lights are at a pedestrian crossing or a junction
 
yes. just to make it plain to you i'm talking about cars going through lights that for them are red, not them going through lights that for pedestrians are red, whether these lights are at a pedestrian crossing or a junction
No shit. So am I. You don't seem to know what a pedestrian crossing is and you haven't come back with any statistics to say I'm wrong so not sure I can be arsed with this.
 
Again, lol. I ride on the roads, and stop at all lights. The simple truth is that is city traffic I’m just way, way faster than any car.

No one cares that you cycle faster than 8mph, the example simple chose 8mph for the bicycles and 22mph for a car, with no indication those might even be average speeds.
 
Anyone who lives or frequents London will know that the absolute overwhelming majority of cyclists jump at least some traffic lights on a daily basis, while a sizeable majority of drivers never or very, very rarely do. It's the pinnacle of absurdity to claim otherwise.

If any fewer than 95% of London cyclists jump red lights at least once in every single journey they take, I'll eat my fucking hat. No, make that 98%.
 
No shit. So am I. You don't seem to know what a pedestrian crossing is and you haven't come back with any statistics to say I'm wrong so not sure I can be arsed with this.

Err, it was you that made this frankly bonkers claim -

More motorists than cyclists jump red lights.

- it's for you to come up with stats to prove your claim, not for others to disprove it, that's how things tend to work around here.
 
Err, it was you that made this frankly bonkers claim -



- it's for you to come up with stats to prove your claim, not for others to disprove it, that's how things tend to work around here.
And yet people have clearly asserted the opposite all over the thread, in fact you are right now, and never been asked for proof.
 
No shit. So am I. You don't seem to know what a pedestrian crossing is and you haven't come back with any statistics to say I'm wrong so not sure I can be arsed with this.
There are as you ought to know six sorts of pedestrian crossings although here I'm only referring to the ones with traffic lights. You haven't come out with any stats so I don't think you're really in a position to be arsy about this
 
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