Mitzie Clough: No, aircraft contrails do not contribute significantly to global dimming. In fact, the Intergovernmental Panel on Climate Change Fourth Assessment Report (IPCC AR4) has contrails as a slight warming effect, although it is several orders of magnitude smaller that warming due to long-lived greenhouse gases or the cooling (or global dimming) due to aerosols. Even though contrails aren't particularly well understood, their effect on climate is negligible....Show more
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