For every pound cities across the world invest in walking and cycling projects, for example, the returns average £13; here in Britain, it could be as high as £19. Investing in green spaces and public transport clears both the air and the roads, and makes cities pleasant places to live.
To find more on this story click here; http://www.theguardian.com/commentisfree/2015/jun/10/cities-healthy-parks-cycling-economy
