Cards (2)

  • Method: Combustion of fossil fuels
    O2 conc. in air: Decreases
    CO2 conc. in air: Increases
    Why? Burning uses up oxygen, and produces carbon dioxide
  • Method: Deforestation
    O2 conc. in air: Decreases
    CO2 conc. in air: Increases
    Why? Fewer trees means less photosynthesis + Trees are usually burnt (combustion) + Decomposition of tree trunks (respiration)