http://www.youtube.com/watch?v=jbkSRLYSojo&feature=player_embedded
All this presentation of Rosling is based on the work of Fogel Nobel prize of economy who wrote:
The Escape from Hunger and Premature Death, 1700-2100: Europe, America, and the Third World. New York: Cambridge University Press, 2004. 189pp. ISBN 0-521-80878-2.
I highly recommend this book where Fogel described another trait of our growing civilisation the technophysiological evolution of humankind.
BTW it's the live refutation of the pauperisation thesis by liberals and other leftists.
Actually a masterpiece of internet teaching!