Earlier quoted context omitted.
All the numbers we have heard about causes, haven't altered the overall increase in the PPM co2 number. I don't trust that we won't discover more about this situation. My hunch is flying is one of the biggest feedback mechanisms, because of where it happens (high in the atmosphere), how it interacts with the ecosystem (contrails), and the sheer volume of fuel used daily (economic vested interests). I see contrails ev…
This should be some interesting reading for you if you haven't read it already: Some scientists believe that from the days after 9/11 (when everybody was grounded) that planes and their pollutants actually have a cooling effect on the planet; they reflect sunlight more into space. [1] http://www.pbs.org/wgbh/nova/space/contrail-effect.html
Water vapour from planes (contrails) have a complex effect and is not yet fully understood see:
http://www.smithsonianmag.com/science-nature/airplane-contra...