In TV & Radiofollow-up:
Snowball Earth BBC2 9.00pm Thursday 22nd February 2001
Books and articles: Climate & Life by Mikhail Budyko Neoproterozoic Snowball Earth simulations with a coupled climate/ice sheet model Nature, May 25th 2000 Considering a Neoproterozoic Snowball Earth Science, May 14th 1999 Weblinks: http://www.eps.harvard.edu/people/faculty/hoffman/snowball_paper.html From Paul Hoffman's website http://www.gps.caltech.edu/users/jkirschvink/ Joe Kirschvink's webpage
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