Earth is a beautiful planet. It is also small, fragile, crowded and ravaged by overpopulation and over development, primarily in coastal areas. Even if birth rates in developing countries rapidly decline, which seems unlikely, there will be twice as many of us by 2050. At the same time, rapid economic development around the world will further diminish our planet´s biodiversity. In this century 20-50% of earth's species will be wiped out by earth's most powerful exterminator--us
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