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Carbon Cycle. Carbon. Carbon exists in the nonliving environment as: Carbon dioxide (CO2) Carbonic acid ( HCO 3 − ) Carbonate rocks (limestone and coral = CaCO 3 ) Deposits of Fossil fuels Dead organic matter. Organic Carbon. Hydrocarbons: CH 4 Carbohydrate: CH 2 O.

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Presentation Transcript
carbon
Carbon

Carbon exists in the nonliving environment as:

  • Carbon dioxide (CO2)
  • Carbonic acid ( HCO3−)
  • Carbonate rocks (limestone and coral = CaCO3)
  • Deposits of Fossil fuels
  • Dead organic matter
organic carbon
Organic Carbon
  • Hydrocarbons: CH4
  • Carbohydrate: CH2O
inorganic carbon
Inorganic carbon
  • Carbon Dioxide: CO2
  • Calcium Carbonate: CaCO3

Mandale Limestone Quarry

carbon reservoirs1
Carbon reservoirs
  • The atmosphere.
  • The biosphere (include fresh water systems and non-living organic material, such as soil carbon).
  • The oceans ( including dissolved inorganic carbon and living and non-living marine biota).
  • The lithosphere (sediments, Earth core including fossil fuels).
carbon is released into the atmosphere in several ways
Carbon is released into the atmosphere in several ways
  • Respiration by plants and animals.
  • Decay of animal and plant matter.
  • Combustion of organic material
  • Production of cement.
  • The ocean releases CO2 into the atmosphere.
  • Volcanic eruptions and metamorphism
carbon is taken from the atmosphere in several ways
Carbon is taken from the atmosphere in several ways
  • Photosynthesis.
  • The oceans when the seawater becomes cooler, more CO2 dissolve and become carbonic acid.
  • In the upper ocean areas organisms convert reduced carbon to tissues, or carbonates.
photosynthesis
Photosynthesis
  • CO2 + H2O + sunlight  CH2O + O2
respiration
Respiration
  • CH2O + O2 CO2 + H2O + energy
combustion or oxidization of hydrocarbon
Combustion or Oxidization of hydrocarbon

CH4 + 2 O2 CO2 + 2 H2O + energy

human impacts on the carbon cycle
Human Impacts on the Carbon Cycle

Burning fossil fuels have serious impact on the carbon cycle.

fossil fuel
Fossil Fuel

86% of global primary energy consumption is fossil fuels.

fossil fuels
Fossil Fuels
  • Petroleum
  • Natural Gas
  • Coal
co 2 concentration
CO2 Concentration

Pre-Industrial value: 280 ppm (600 billion tons)

Current value: 380 ppm (800 billion tons)

Critical value: 560 ppm (1200 billion tons)