The human family has created an environmental calamity that has the power to undermine its civilization—a calamity of many factors; a calamity that will alter your environment, that will deplete your soils, that will dry up your rivers; a calamity that will bring an end to your growth and expansion; a calamity that has been the product of decades and centuries of misuse of the world, with no thought of tomorrow, as if the world were an endless bounty that could be exploited without limit.