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"We already have the statistics for the future: the growth percentages of pollution, overpopulation, desertification. The future is already in place."

"We have to educate all of our people to an understanding of the arithmetic and the consequences of growth, especially in terms of populations and in terms of the earth’s finite resources. We must educate people to recognize the fact that growth of populations and growth of rates of consumption of resources cannot be sustained."

“An ethic of human rights, of sharing, and of equity without a practically expressed awareness of ecological limits is a setup for disaster.... If we want peace, democracy, and human rights, we must work to create the ecological condition essential for these things to exist. In other words, a stable human population at--or slightly less than--the environment’s long-term carrying capacity.”

“Conventional economic ‘laws’ such as that of supply and demand, are ill-equipped to deal with the biggest of all environmental problems: no level of demand can bring another Earth into being.... Perpetual total economic growth alongside constant population growth is ecologically, mathematically and logically impossible.”

“Democracy cannot survive overpopulation. Human dignity cannot survive overpopulation. Convenience and decency cannot survive overpopulation. As you put more and more people onto the world, the value of life not only declines, it disappears. It doesn’t matter if someone dies. The more people there are, the less one person matters.”

“The biggest cause of climate change is climate changers: human beings. Deciding to stop at two children, or at least to have one child less, is the simplest, quickest and most significant thing any of us could do to leave a sustainable and habitable planet for our children and grandchildren.... Thus, in both developed and developing worlds, the condom, the Pill, and the intrauterine device ought to be as powerful symbols for the green movement as the bicycle.”

~John Guillebaud of the Optimum Population Trust

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