Hans Rosling explains population growth [1] , and his hopes for the future using lego. This is as part of Ericsson’s “2020 Shaping Ideas” project [2].
I really like what Hans has to say. Its inspirational, and presents a hopeful future for us all. I recommend going through the other videos at [2].
[1] http://www.gapminder.org/videos/population-growth-explained-with-lego/
[2] http://www.ericsson.com/campaign/20about2020/