Evidence has emerged that changes in the winds high up in the stratosphere have a powerful effect on ocean currents a mile below the surface.
Even minor volcanic eruptions can release enough aerosols into the atmosphere to affect global temperatures, thanks to a boosting effect from weather systems such as monsoons.
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The ozone layer is regenerating, and could be back up to strength by the middle of the century, according to a UN report.
The Asian monsoon is sending pollutants up to stratospheric heights and spreading them right across the globe, says the National Center for Atmospheric Research (NCAR).