I think its hard to infer that I'm an idiot for simple stating an opinion counter to yours.
I don't know why you suggest riding a bicycle is more environmentally expensive than driving a car. Lets play with the numbers shall we?
A bunch of banana's costs about $2 where I live. Lets assume that the component cost of bananas in terms of fuel is close to 100%. That would mean that to produce those bananas less than $2 of fuel was been spent. Probably much less, but lets keep the number at $2.
Lets assume you drive a fuel efficient vehicle. I'll give you 40 mpg. Lets say that your round trip drive to work is 20 miles. Lets price petrol about $2 a gallon.
Lets also a assume that I eat an extra 2 bananas over my friends who drive to work. I believe it to be less than that. Lets say there are 6 bananas in a bunch.
So your driving to work costs:
20 miles / 40 mpg = 1/2 a gallon a day. (plus your car maintenance expenses)
My costs of riding to work:
$2 a bunch * 1/3 of a bunch a day / $2 a gallon = 1/3 of a gallon a day. (plus the cost of maintaining my bicycle.
Now I would contend that you might well drive a more expensive vehicle than that, I eat less than 2 bananas a day to drive my bicycle, the environmental cost of producing a banana is less than 100% of its total cost, there are more than 6 bananas in a bunch of bananas where I live and that the mileage related costs of maintaining a car vs. a bicycle are relevant. I admit I do own a car so I can't claim all the production costs of a car as an advantage. Also I admit that it is possible that the environmental cost of making a banana _could_ be more than 100% of its cost in fuel, but I don't think so. I'm not sure about the cost of fuel, but I think if that is higher (as it is in banana producing nations like Brazil and India) that works to strengthen bicycles advantage too since it would mean using less fuel to make the banana at that price.
But anyway, bicycles are cheaper. Probably much, much cheaper, but even giving you _every_ benefit of the doubt bicycles win.
cheers,
david
PS. Most upsetting of all is you force me to sound like a rabid greeny just to argue a ridiculous contention with you. I'm not, I'm just a person who would like to personally do something about a problem that I judge to be real. On the other hand thank you for forcing me to do the exercise, I thought it might turn out to be many orders of magnitude better, but now I think I can just say riding a bicycle is much better.