This is not my article but it’s so good I had to post it here.

In it, it states that

in 2007 when a UNICEF survey rated it among the worst places in the world to grow up. At that time Play England, part of the British National Children’s Bureau, found that about half of all children were being prevented from climbing trees and 17 per cent were not allowed to play running or chasing games.

http://m.theaustralian.com.au/national-affairs/opinion/playing-by-the-rules-makes-prisoners-of-children/story-e6frgd0x-1226173452613

Image by duncan via Flickr