The world successfully tackled a dangerous pollutant. But did it accidentally warm the planet in the process?
By Laura Paddison, CNN (CNN) — The huge cargo ships that criss-cross the world’s oceans sometimes leave “tracks” in their wake — long, wispy clouds that trail through the sky, lasting for a handful of days at most before disappearing. These ghost clouds look beautiful, but they are a visible sign of deadly air pollution.
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