We can and should control surface pollution as that effects air quality yet there is a huge difference between controlling air quality as that remains constant in cold or warm environments while temperatures constantly fluctuate from day to night, month to month and year to year, in the Western isles of Europe we are having a particularly cool and wet summer.
Look for OnAir service to drop initially on short flights in Western Europe, though Airbus intends to take it global -- if the FAA's cool with it, anyway.
Now if you have the engine of the whole world slowing down and you have continued problems in Europe, and you have the first year of the Presidential cycle, which will likely to cool down the U.S., and you have this miserable fiscal cliff problem.