Yes, theory. Cloud-seeding has been known and practiced since the 1950s, but it does not produce contrails. I have seen persistent contrails since the mid 1950s. The only reason we see more of them today is because with the introduction of new turbofan engines, airliners operate at much higher altitudes than before, where the meteorological conditions are different.
Yes, theory. Cloud-seeding has been known and practiced since the 1950s, but it does not produce contrails. I have seen persistent contrails since the mid 1950s. The only reason we see more of them today is because with the introduction of new turbofan engines, airliners operate at much higher altitudes than before, where the meteorological conditions are different.
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