Interesting, worth a listen.
"Martin Rees asks: Is this our final century?
Speaking as both an astronomer and "a concerned member of the human race," Sir Martin Rees examines our planet and its future from a cosmic perspective. He urges action to prevent dark consequences from our scientific and technological development.
About Martin Rees
Martin Rees, one of the world's most eminent astronomers, is a professor of cosmology and astrophysics at the University of Cambridge and the UK's Astronomer Royal...."
http://www.ted.com/talks/martin_rees_asks_is_this_our_final_century.html
"Martin Rees asks: Is this our final century?
Speaking as both an astronomer and "a concerned member of the human race," Sir Martin Rees examines our planet and its future from a cosmic perspective. He urges action to prevent dark consequences from our scientific and technological development.
About Martin Rees
Martin Rees, one of the world's most eminent astronomers, is a professor of cosmology and astrophysics at the University of Cambridge and the UK's Astronomer Royal...."
http://www.ted.com/talks/martin_rees_asks_is_this_our_final_century.html