Talk by noted astronomer Carl Sagan. Sagan begins with a history of human population growth, and the current world population being a threat to continued existance. There are, Sagan suggests, four areas which must be addressed if humanity is going to continute into the future: 1) nuclear weapons; 2) ozone; 3) global warming; 4) population growth.|HOW AND WHY TO LOVE OUR PLANET / Carl Sagan. - Talk by noted astronomer Carl Sagan. Sagan begins with a history of human population growth, and the current world population being a threat to continued existance. There are, Sagan suggests, four areas which must be addressed if humanity is going to continute into the future: 1) nuclear weapons| 2) ozone| 3) global warming| 4) population growth. - RECORDED: The Global Forum, Moscow, Jan. 1990.
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