Is Bicycling Sustainable?
It depends on whether you bicycle near and with a lot of fossil-fuel-burning automobile traffic. Accumulating research is confirming a common-sense notion — breathing tailpipe emissions cannot be that good for you. In fact, it is bad for you. One short-term effect is that it reduces your heart rate variability–it’s capacity to quickly change it’s rate and respond to stress. Read the article!
My roughly written comment on the article follows: