Human powered transport such as walking and cycling produces no direct carbon dioxide emission. Propellants used by Ariane 5 and the space shuttle produce no carbon dioxide. Although both do use hypergolic propellant which does produces carbon dioxide, it is generally used in relatively small quantities for post-launch manoeuvring, well-above any layers of the atmosphere that are relevant to climate change.

External links

  1. http://www-pao.ksc.nasa.gov/kscpao/nasafact/count2.htm
  2. http://www.madsci.org/posts/archives/2000-10/973014746.Es.r.html
  3. http://www.esa.int/SPECIALS/Launchers_Access_to_Space/SEM0LR2PGQD_0.html

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