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Human Impacts (Overpopulation (clear-cutting (humans need more space, less…

- - - - area of permanent ice cover is declining
- - - - enters air from over fertilized field and livestock waste
        
        number of health problems for animals and humans, such as permanently damaged lung
    - - from nitric and suffer acid
        
        created from oxides and suffer oxide (from burning fossil fuels)
        
        damages trees and acidifies soil and water
        
        too acidic for fish
  - - - excessive amount of nitrogen can cause algae and result in a loss of oxygen in the water
- - - - extinction of species
        
        adds to forest depletion
      - air pollution
  - - - causes temperature to rise
- - - - soil washes away, causing farmers to move on and perpetuate the cycle
        
        unsustainable agricultural practices