4.a Human activities causing change

Question 1

human activities include ….

Answer 1

• rapid population growth
• economic growth
• deforestation
• urbanisation

Question 2

scale of change

Answer 2

both regional and local

Question 3

water

Answer 3

• increased demand for water
• reduction in fresh water supply
  -deforestation had reduced evapotranspiration, run off and throughflow rates
• extensive deforestation has lead to climates drying out and preventing regeneration

Question 4

carbon

Answer 4

• depletion of long term carbon stores (fossil fuels )
• removal of billion of tonnes of carbon from geological stores
• increased the transfer of co2 into the atmosphere for biosphere
• acidification of oceans threatens marine life also reduces the amount of co2 stored in oceans
  -carbon stored in wetland has reduced

Question 5

climate changes (water)

Answer 5

• increased evaporation and amount of water vapour in the atmosphere
• increased global temps
• more precipitation and run off = increased flooding risk
• more frequent and powerful storms

Question 6

climate change (carbon)

Answer 6

• increased temps increases rate of decomposition
• forests are being replaced by grasslands which is reducing the biosphere store
• carbon frozen in permafrost is being released further increasing global temps
• rates vary regionally due to respiration, photosynthesis and decomposition rates