My bike could not answer all my questions. I decided to ask my collaborators. This is what they told me:
And here is the questionnaire (in German only)
Here are my answers to the questions my collaborators asked me:
Q: How much CO2 has been saved on your trips?
A: To be honest, I don’t know. We humans also exhale CO2; the more the more we exercise. Judged by the level of physical effort I put into my trips the amount of CO2 might be limited. So, may be next time I have to hold my breath when cycling.
Q: Are there other people with similar ideas than you (ie collaborating to move stuff carbon-neutral by cargo bike)?