The historical context of human impact on the environment. Biodiversity at all levels is currently being lost as a result of human impacts, most irretrievable in the extinction of species. World conservation union is a non government organization which maintains the red list (regularly updated list of species facing high risks of extinction) Extinction is only one part of the story of biodiversity loss; the larger part of the story is the decline in population sizes of many organisms. Declines in numbers are accompanied by shrinkage of species" geographical ranges. Upper palaeolithic people the period in which farming became more widespread. Very knowledgeable of the biological world in which they lived. Although there was greater emphasis on the domestication of plants and animals, most of the population remained mobile. Began eating food that was planted and raised instead of collect from the wild. Neolithic or late stone age the practice of hunting and gathering had become more of a science.