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population climate distribution change migration cyclone management hazards bangladesh flood river global ecosystem deposition rain tourism demographic transition model urban ratios dependancy plant succession globalisation bratislava rio ecosystems malthus settlement boserup sparse statistics national dense fertility capacity carrying overpopulation darfur displaced resources refugee capital canopy growth conservation natural favela shore long weathering erosion transportation geology geomorphology sustainable development danube hydrograph map work pull push model rome club leisure negative feedback relationship correlation spearmans rank weather population pyramid population explosion death rate birth rate population change demographic biomass popualation gersmehl soil nutrient cycle litter mortality density medcs ageing populations harvard system footnotes extended essay referencing ecumene communications conainerization front relief convection precipitation dynamic equilibrium tourism impacts sidra tornado drought africa ethiopia greenhouse effect warming microclimate heat island pollution acid. enso nina la nino ozone depletion hole cfcs montreal protocol positive feedback drift spits bars beaches cave arch stack headland bay groynes revetments beach replenishment drainage basin source mouth watershed producers consumers food web food chain energy trophic levels biodiversity abiotic biotic photosynthesis food adventurous journey farming revision igcse earthquakes ecuador mexico typhoon hurricane usa youthful populations ledcs nich city janeiro mcdonalds starbucks internet transnational corporation multinational company biome volcanoes plate volcano cotopaxi norfolk slum steppe approach shanty town broads vegetation altitude amazon mato grosso soya russian clothing water oil ehrlich simon obesity famine hunger resrouces rocinha scheme help self urbanisation zone reefs systems tectonic theory kashmir kobe situation site use land hierarchy dispersed nucleated linear award international equipment coral