“By our very nature we are builders. In an attempt to create a comfortable and stable habitat we are constantly altering the environment. We have put acre after acre of land into cultivation, sometimes terracing steep hills and mountains with massive rock retaining walls. We have built reservoirs and aqueducts, huge cities, and extensive roadways. We have built levees to claim lands from the ocean and from flood plains. We have erected bridges over rivers and we have carved tunnels through mountains. Many times we have bestowed upon a setting physical changes that accomplish our intended purpose and at the same time add to the spirit and character of what nature had already provided. In other instances we have failed miserably at maintaining any semblances of natural or ecological function. We must realize that our insensitivity to the natural setting is part of insensitivity to ourselves, reflecting a lack of understanding of our aesthetic needs, and of ourselves as an integral part of nature...”