Wow, I started to research this and it's a shocker! We've 1% of the world population and 20% of the world surveillance cameras... that's 5 million which accounts for 12 for each person!
Astonishingly London has 10,000 dedicated crime cams - at a massive cost of £200 million - or nearly half a billion dollars if you're in the US.
I'm still researching, if you've any comments, please make 'em, or mail me at podcastpaul@gmail.com
