this post was submitted on 20 Sep 2023
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Embedded CO2 for a bike is like 100kg (that's what 4 trees in your backyard absorb a year), which over a lifetime of 30 years is negligible.
You say negligible, but what you mean is negligible on a scale of the CO2 emissions we are used to. Human body CO2 emission is just as negligible on that scale.
Ill do some quick maths: According to the first source on google, an average human burns 3kcal/min walking and 5kcal/min biking at 15km/h, which is about 3x as fast as walking. Considering that, we arrive at a difference of 1.33kcal/min by walking instead of biking. Estimates suggest 1.3g CO2-equivalents per kcal for average consumption (much lower for vegans), so thats 1.73g CO2/min. 100kg CO2 for bike production would take 57,800min of walking, thats almost 963h. An average bike will probably be used more so I guess you are right and bikes are indeed more efficient than walking :D
CO2 emissions that fall within natural cycles in terms of scale, are negligible.
I agree, but the question at hand was not whether one or the other was negligible, but which is more efficient: walking or biking.
I responded to the wrong comment, sorry