Aldo Leopold, the early 20th century's Henry David Thoreau, said that we should think like a mountain, with a sense of permanence and a long view. At the beginning of the 21st century, we are at a peak of human power, wealth and information... We need to look back at our wonderful natural and human heritage, and cherish and protect the abundant values to be found there. We need to look out to the sides and see other parts of the world that need our help and can provide good ideas to go forward... We need to look ahead