[T]he real per capita income of the world now is about 7-8 times that of a century ago. If we proceed along an environmentally responsible path of growth, our great grandchildren in a century will have a real per capita income 5-6 times higher than our level now. Is it worth the risk of environmental disaster to disregard environmental protection now to try to grow a little faster? If this faster growth could be sustained, our great grandchildren would enjoy a real per capita income 7-8 times (instead of 5-6 times) higher than our level now. However, they may live in an environmentally horrible world or may well not have a chance to be born at all! The correct choice is obvious.