I enjoy Lloyd Alter’s writing. It’s a combination of understated humour and serious environmental action.
Here, he examines a claim that bike riding does have a carbon footprint.
My immediate thought was, the extra food the rider burns up is already part of the natural carbon cycle, while a car uses fossil fuel, which is an addition. Lloyd indeed ends with this note, but the rest of the article is interesting.

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About Dr Bob Rich
I am a professional grandfather. My main motivation is to transform society to create a sustainable world in which my grandchildren and their grandchildren in perpetuity can have a life, and a life worth living. This means reversing environmental idiocy that's now threatening us with extinction, and replacing culture of greed and conflict with one of compassion and cooperation.
It is interesting. Glad he ended it with the biogenic to the non-biogenic pict. That’s powerful.
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