No, bikes arehttp://www.blogger.com/img/blank.gif not absolutely pure. We are, after all, nothing but humans. But still, a biker is 10 times better than a car-driver when it comes to CO2. Add to that the noice, the NOx, the particles etc and it's clear that cars have to be fought.
For you knowing Swedish check out the Cykelsmart blog for a calculation.
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