JOHN CHANCELLOR, anchor: On clear days, you can often see long white lines being traced high in the sky. They are contrails of jet aircraft. They’re actually long, slender clouds. Other men are finding them especially fascinating because the theory is being developed that those long, white lines may be changing our weather for the better. Details from Roger O’Neil. ROGER O’NEIL, reporting: The exhaust from jet engines, usually seen as long, thin trails of white clouds behind high-flying jet airplanes, may be a big reason why there …
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