Broadcaster and naturalist Sir David Attenborough presents the 2011 RSA President's Lecture.
The dangers facing the earth's ecosystems are well known and the subject of great concern at all levels. Climate change is high on the list. But there is an underlying and associated cause -- population growth.
Sir David Attenborough
Sir David Attenborough is a Natural History reporter for the BBC and best-known for the nine-part "Life" series which appeared on the BBC from 1979-2008.