The problems of survival ours and our fellow creatures require knowledge and technique such as conservation. To date we may learn from the past but it is no solution simply to recreate the land scape and methods of our ancestors.  Their techniques could not feed the present world population and would not begin to cope with the modern conservation. Agriculture that is productive enough to feed us that is also benign is extremely difficult to devise and also the science of conservation extremely delicate. Therefore, we need good science in short to do the things that are needed.