Aircraft, contrails and climate change - options for change

White contrails often seen streaking across the sky are the water vapour in hot aircraft exhaust which freezes when it meets cold moist air in the atmosphere. These contrails can and do form into wispy cirrus clouds which trap heat and thus contribute to global warming and more so that the actual carbon emissions from the aircraft themselves. Are there options to address this effect ?

Noting that there are few viable technological options for reducing contrails, one proposal canvassed by researchers, Irvine, Hoskins and Shine, is to consider re-routing aircraft to control emissions depending on the weather. In one transit model posited by the researchers, a 13.7 mile detour for a transatlantic flight eliminated a contrail 62 miles long and the clouds which would have formed from it.

Whether this method can have a practical application remains to be seen. The need for considering relatively cost-effective options with a positive environmental result remains paramount.

The original research article can be found at the link below:

Environmental Research Letters - Contrails and Climate Change