Two years later, at the first Earth Day, its founder predicted that the greatest challenge to the environment would be population growth.

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Y. art collective, a remote-controlled gray blimp that hovered ominously over the ferry on the way to New Jersey and a cheeky presentation from ICQ founder Yossi Vardi on why excessive heat from laptops seriously impairs male gonads and is the root of population decline in certain nations of the developed world.

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Studies into the gel by the American Population Council's centre for Biological Research are being funded by the foundation set up by Microsoft founder Bill Gates.

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