Independent, 10 April 2011:
Your leader (“The greatest emergency of all is being ignored”, 6 April) points to the similarities between man-made ozone depletion and climate change. In fact the two are directly linked.
Stratospheric ozone depletion takes place on the surface of ice crystals, so is greatly increased when the stratospheric temperature falls. Global warming traps heat at a lower level in the atmosphere, thus cooling the stratosphere and providing the ideal conditions for ozone depletion to occur.
This phenomenon neatly illustrates the way that man-made releases can interact to destabilise the atmosphere and threaten the systems that sustain life on this planet.
Dr Robin Russell-Jones
Stoke Poges, Buckinghamshire