It remains unclear what specifically is driving the move, though climate change is a likely suspect, along with depletion of the ozone layer. (scientificamerican.com)
For the first time, it has been shown that the rate of ozone depletion in the upper stratosphere — 35 to 45 kilometres up — is slowing down. (newscientist.com)
Climate change «could delay the recovery of the ozone hole well into the second half of this century,» he said. (greenbiz.com)