d) Human influences on the environment

SO2 = Sulphuric acid. Acid rain (SO2 & NOx) = Acidification of water and sea ∴ kills aquatic life and trees, erodes limestone buildings
CO = Binds to haemoglobin. Asphyxiation
Greenhouse gases = Water vapour, CO2, nitrous oxides (NOx), Methane (CH4), CFCs (refrigerator coolants)
Global warming= Polar ice caps melt, Sea level rise, Changes in rainfall (drought/floods), Extinction of polar species
Deforestation = leaching, soil erosion, disturbance of water cycle (less transpiration, more drought/flooding), disturbances of the balance of O2 and CO2 in atmosphere (less trees & trees burnt)
Leached nitrates from fertilisers = algal blooms develop, sun blocked, plants die, ↓O2, fish die, (NO3 supply stops so algal blooms die), lots of decomposition by fungi/bacteria, Biological Oxygen Demand (BOD) ↑, everything dies. EUTROPHICATION
Sewage - Contains lots of bacteria/micro-organisms + nutrients, bacteria decompose sewage, bacteria respire, BOD ↑, fish die (∴ nutrients ↑,algal blooms, eutrophication)
Detergents,fertilisers and sewage can cause eutrophication

	Created by Noushi 9 over 8 years ago

GCSE Biology Note on Biology iGCSE Notes, created by Noushi 9 on 28/03/2016.