I researched this last year. According to the Exercise, Recreation and Sport Survey 2005 Annual Report there are 82,800 rock climbers in Australia. (seems way high) This is similar in size to scuba diving (86,800) and more than shooting sports (76,000), triathlon (44,800) or athletics (72,000).
The number for the US is around 10,000,000. The EU was much hard to get numbers for, so using particpation rates for climbing in the UK 2-3% of the population, I estimated the figure in the EU to be around 20,000,000.
So globally maybe 30million +.
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