TURIN,
You are absolutely right, but as Tesco have been telling us ad nauseum for years "every little helps". There needs to be a sea change in public attitudes and demands. Fast fashion and the "must have now" attitude towards buying throw away tat has to change and people have to be convinced to move away from cars for short journeys.
Baby steps in these areas as well as reducing wasteful aviation activity such as private jets, positioning etc could together produce meaningful reductions. In isolation aviation is a small cog in a large wheel.