Environmental Science Notes PDF

of 6 Neomalthusians believe that un checked population will growth lead to depletion and resource therefore families should plan and use of sustainable resources Key Figure Paul Ehrich Technological Optimist beli...

of 6 Neomalthusians believe that un checked population will growth lead to depletion and resource therefore families should plan and use of sustainable resources Key Figure Paul Ehrich Technological Optimist believe that technology will overcome resource limitations Innovation and economic development are solutions Key Figure Julian Simon Social Justice Advocates believe believe Issues population rooted In Inequality are poverty and resourcedistribution Key Figure Greta Thunberg  of 7 The demographic transition is a model that describes how a society's pop changes over time of economic develope Stage 1 Pre Industrial High Birth rates high death rates Stage 2 Early Industrial High Birth rates lower stage one death rates to due to medical advancement Stage 3 Mature Industrial Decline In birth rates steady death rates start to balance Stage 4 Post Industrial Low death Birth rates Factors like higher ed equality economy make this happen Death rates fall due medical advancements overall increase in knowledge of virus Birth rates fall due to urbanization cost of children high pop stze Death Got Birth IT  ge of 8 The two that occur are things bioaccumulation Bo magnification Bio accumulation 9s when an organisms body absorbs the chemical faster than than It can release it This causes It to store In tissues lake fat Bio magnification is when organisms are consumed up the food chain and the chemica concentration Increases at each trophic level DDT Is a well known chemical these are usually fat soluable because they do not usually breakdown stored In fat this process explains how POPs travel long distances through the atmosphere When In warmer climates they evaporate and then travel to colder climates and releases back into the ground this means it can affect the wildlife causing both things I 95 The three main categories are Insecticides herbicides and fungicides Insecticides DDT Pro Highly affective in controlling pest Con Bioaccumulation Beomagnetication In wildlife Herbicides Roundup Pro Increases crop yield Con Can lead to herbicide resistant weeds Requiring stronger chemicals Pro No fungal Infections In crops Fungicide Mancozeb Con can be toxic to wildlife especially aquatic  1 of green revolution 9s a period of agricultural Oa The transformation marked by the use of high yield crop varieties chemical forts pesticides etc Helps Increase food production Ifood land Improved farming efficiency Genetic engineering manipulates the plants genetic to be better 19k pest resistance and drought tolerance Helps Reduce lost from pest can be engineered for poor soil Reduces needs for chemicals These help produce more food and the increase crop ressilance 11 The process by which soil rock and other surface materials are worn away and transported by natuarul forces the main causes are water wind deforestation agriculture urbanization and live stock Sheet Is the removal of the thin layer of soil by water or wind Rill Is small channels form in the soil as water runs off Gully 9s similar to rill but creates more destructive channels Ways to reduce Contour plowing terracing cover crops crop rotation and windbreaks 2 Pragmatic Gifford Pinchot advocated for sustainable use of natural resources Issues Overuse of forest loss of wildlife and a need for responsible resource management Modern Environmentalism Rachel Carson wrote a book raising awareness about the dangers of DDT  of Issues Pollution over use of dangerous pesticides stronger environmental regulation Earlier eras nature as something so to be conquered while these ones emphasised responsible management