122 MAN ON THE LANDSCAPE 



(e) Pollution 



(1) types found 



(a) chemical 



(b) physical 



(c) biological 



(d) thermal (discharge of hot water by factories) 



(2) sources 



(a) industrial and commercial 



(b) domestic 



(c) agricultural 



(3) where found 



(a) streams 



(b) lakes and reservoirs 



(c) springs and wells 



(4) effects 



(a) on health (human and livestock) 



(b) on fish and other wildlife 



(c) on recreational opportunities 



(d) on industries, cities 



(e) on jobs 



(f) Siltation 



(1) extent in 



(a) reservoirs, lakes, ponds 



(b) harbors 



(c) streams 



(2) causes 



(3) costs and damages to 



(a) power production 



(b) navigation 



(c) irrigation 



(d) aquatic plant and animal life 



(e) recreation 



(g) Forest Destruction 



(1) area converted to cropland and pasture 



(2) area needing reforestation 



(3) area needing fire protection 



(4) number and extent of fires reported last year 



(5) effects of 1 and 4 on wildlife 



(a) species depleted 



(b) species encouraged 



(6) economic results of all the above 



(h) Overgrazing 



(1) evidence and extent 



(a) changes in carrying capacity of grass lands 



(2) economic effects of overgrazing 



(i) Wildlife Decline 



(1) species originally present 



(2) causes of declines 



(a) changes in food, water, cover 



