And how is the depletion of the ozone layer related to ice ages?
The ice age/interglaciary cycles may have to do with very large period astronomical cycles like the one involving the translation movement the Sun does around the Milky Way's mass centre (250 000 000 years at a speed of 250Km/s or 900 000Km/h) and the variations of the Sun's "height" relative to the galaxy's plane while translating (+- 80 parsecs; 1 parsec=3,26 light years).
They are surely related to cyclic variations on the form of the earth's orbit, this time involving a lesser time scale (90 000 to 100 000 years), cyclic variations on the inclination of the Earth's axle of rotation (40 000 years) and finally we have the equinox precession cyclic phenomenon (21 000 years) (Milankovitch Model).
Also the very relative positions of the Earth's land masses can strongly influence the climate by creating air convection currents and by diverting ocean currents (Wegener).
Read:
"Genesis" by John Gribbin
"The Chaos Comet" by John and Mary Gribbin (the book is not with me at the moment and so I'm not entirely sure about the english title)
Also there is one other book I never read from the same author specifically about the ozone layer with an english title like "(The) hole in the sky".
Or take a look at this page for more books by the same author:
www.fantasticfiction.co.uk/authors/John_Gribbin.htmTruth be said that none of this is denying that those natural processes involving all those cycles have an effect on the ozone layer, although it doesn't seem to me that an ice age would be a logical consequence of the ozone layer depletion. Ice age would be more likely to arise from an over abundance of dust in suspension on the atmosphere and thus preventing the Sun's heat to reach Earth's surface. Quite the contrary seems to be the work of the famous greenhouse effect gases, mainly carbon monoxide and dioxide, that prevent heat received by the atmosphere to escape to outer space.
But on the other hand CFCs are well known to destroy ozone, or aren't they?
