Makes no difference if he does there are billions of vehicles and not so many cyclists. Also you can't go round killing cyclists for environmental reasons but you can change vehicle technology.
2007-02-14 22:04:40
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answer #1
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answered by hoegaarden_drinker 5
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Interesting.
The Engineering Toolbox gives the CO2 emission rate for a person doing hard work at between 0.33 to 0.38 cubic metres per hour. Lets assume this to be 0.4 cubic metres per hour for someone cycling.
The density of CO2 is 1.98kg per cubic metre, therefore our cyclist would be discharging 0.792kgs per hour. If he is cycling at a speed of 30 kilometres per hour he would take 2 minutes to cover a kilometre and would discharge 0.0266kgs (26.6 grams) of CO2.
A VW Golf 2 litre diesel will emit 153 grams of CO2 to drive a kilometre according to the Vehicle Certification Agency.
So I think a cyclist produces far less CO2 than a car travelling over a kilometre - unless my maths is all wrong......which is perfectly possible as I was out on the juice last night !
2007-02-14 22:28:47
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answer #2
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answered by the_lipsiot 7
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Let's work this out.
An average person exhales about 900g of CO2 per day - that's assuming that that person is not doing any strenous exercise.
Say if we were to set the comparison to a decent cycling trip of 15km/h over an hour, and say that over that hour the cyclist would breathe at three times his resting rate over that whole hour (which is hard work if you think about it).
So in over an hour, this cyclist would exhale:
(900g / 24 hour) x 3
(37.5g/hour) x 3
112.5g of CO2.
A person driving the car would still need to breathe, and thus still exhale 900g / 24 hours = 37.5g of CO2.
An average car would emit about 120g of CO2 per km. So a man driving a car for the same 15km would in total emit:
37.5g + (120g/km x 15km)
37.5g + 1,800g
= 1,837.5g of CO2.
112.5g exhaled by the cyclist against 1,837.5g emitted by the car and driver. Hmmm... no comparison.
Mind you, 120g/km is a bit below average emission for a car - a Ford Focus LX 1.6 would emit 159g/km so that would be 2,422.5g in total.
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Emucompboy: Going downhill the cyclist wouldn't be pedalling would he?
And besides, a car going downhill still needs to have a breathing driver behind the hill, and presumably have had the engine on to go up the hill to begin with. Do you turn off your car's engine everytime you go down a hill? I suspect not, so the car's engine would still be pumping out CO2 even when you coast down a hill in neutral.
2007-02-14 22:06:44
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answer #3
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answered by k² 6
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If you are speaking about a cyclist then it is possible. I have read that the gasses we produce, commony called farts, have been assessed for carbon emmissions.
The peddling of a bycicle would put pressure on the stomach increasing the likelyhood of farts.
2007-02-16 03:06:48
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answer #4
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answered by jupiteress 7
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Under usual conditions, no.
However, if there's a steep down hill, and you don't bother turning on the car's engine, then the cyclist will emit CO2 and the car won't.
2007-02-15 06:24:14
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answer #5
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answered by Anonymous
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of course not ! our metabolic pathways are much more efficient! a cyclist can go 200 km with a couple of sandwiches (more or less 300kcal), 4 hours exercise is nearly 180 liters of CO2 produced. (15 liters/hour of CO2 for normal breathing, 45 liters/hour of CO2 for intense exercise)
a very efficient car can run 20 km with 1 liter, so 10 liter of gasoline for 200km that are 88000kcal and nearly 144000 liters of CO2 (7 kg of gasoline are 803 moles and 1 mole is 22.414 liters and gasoline produce 8 eq of CO2)
2007-02-14 22:09:24
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answer #6
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answered by scientific_boy3434 5
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It all depends on if the cyclist had beans and Brussels the night before
2007-02-14 21:52:51
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answer #7
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answered by bty937915 4
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apparently you mean a motorcyclist? I can't see how a lighter vehicle wit ha smaller engine going the same speed as a bigger vehicle could give the same exhaust issues
2007-02-14 21:56:13
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answer #8
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answered by Dennis G 5
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