Eliminating contrails would cut aviation's climate impact by half, but can it be done? Aviation Week editors Guy Norris, Thierry Dubois and Graham Warwick are joined by NASA scientist Richard Moore who shares the latest research on a problem that some consider to be the low-hanging fruit of sustainability. A full transcript of this podcast will be available here. Read Guy's story about the last flight of NASA's DC-8 and see video of it chasing contrails here.