In this episode, Lucas and Luna explore how airlines like KLM and researchers at D-Wave are using quantum algorithms to reroute flights around persistent contrails — the wispy clouds that trap heat and account for roughly 35 percent of aviation's warming impact. A 2023 Google-funded trial on 70 flights showed that small altitude changes could cut contrail formation by more than 50 percent, and quantum optimization promises to scale that calculation across the 100,000 daily flights worldwide. Lucas walks through why contrails have a greenhouse effect that actually outpaces CO₂ from jet fuel, how binary optimization maps to selecting flight altitudes, and the computational bottleneck that classical computers hit when trying to solve the problem in real time. Luna asks what it would take for quantum hardware to run this at airline scale — and whether the industry has incentive to change. The conversation is anchored to a fresh angle: not quantum batteries or drug design, but the unexpected climate lever of rerouting airplanes to avoid making clouds.

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