Now that we've finished rubbishing scientists for doing science, who's next
I see quite a bit of 'scientific studies' looking for funding attempts by adding 'as it relates to global warming' or in this case, directly, as CO2 increases (ie man made).
I seem to remember that aviation itself is being blamed for global warming by increasing CO2 levels in the upper atmosphere, creating holes in the ozone, and of course, the warming effects of the condensation trails.