Fossil Fuel Combustion

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Presentation transcript:

Fossil Fuel Combustion The Carbon Cycle Oceans Fossil Fuel Combustion Terrestrial Plants Fires Algae /Aquatic Plants Millions of years of heat and pressure Fossil Fuels Decomposition/Respiration

Photosynthesis and Carbon Cycling Decomposition/Respiration In a natural system, growth and decomposition balance one another and the atmospheric carbon dioxide concentration remains fairly stable. When organisms decompose, the reaction is reversed. Carbon dioxide is re-emitted into the air. Photosynthetic plants and algae remove carbon dioxide from the air and combine it with water to build sugar molecules and oxygen molecules. CO2 CO2 CO2 CO2 Terrestrial Plants Algae /Aquatic Plants C6 H12 O6 H2O O2 H2O CO2 H2O H2O H2O H2O H2O Decomposition/Respiration

Photosynthesis and Carbon Cycling CO2 CO2 In a natural system, growth and decomposition balance one another and the atmospheric carbon dioxide concentration remains fairly stable. CO2 CO2 CO2 CO2 Terrestrial Plants Algae /Aquatic Plants C6 H12 O6 H2O O2 H2O CO2 H2O H2O H2O H2O H2O Decomposition/Respiration Decaying Organic Matter

Fossil Fuels and Carbon Cycling Fossil Fuel Combustion CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 Terrestrial Plants Algae /Aquatic Plants CO2 280 ppm 400 ppm Pre-Industrial Modern Since the Industrial Revolution, the concentration of carbon dioxide has increased from 280 ppm (parts per million) to about 400 ppm. However, modern power stations, cars, and airplanes are releasing carbon that has been stored for millions of years in fossil fuel reserves. This disrupts the natural balance of the carbon cycle. Decomposition/Respiration

The Carbon Cycle: Overview Oceans Fossil Fuel Combustion Terrestrial Plants Fires Algae /Aquatic Plants Fossil Fuels Decomposition/Respiration

Climate Change: Effects Ocean Acidification Sea Level Rise Increasingly Severe Storms and Droughts Changing Agricultural Patterns Migration of Tropical Diseases Poleward Changing Ocean Circulation Patterns

Ocean Acidification The Carbon Cycle Atmospheric carbon dioxide (CO2 ) levels are rising because of fossil fuel combustion. The oceans uptake much of this CO2 When the CO2 dissolves, carbonic acid is formed This acidification brings consequences for marine organisms and the system of which they are a part Some organisms will be harmed; others may benefit Image source: http://www.thew2o.net/

Case Study: Diatoms Single-celled algae Base of the marine food web Fix 20% of carbon globally A portion of diatom remains sink and, over millions of years, oil is formed from them How will increased dissolved carbon dioxide affect diatoms’ ability to fix carbon? What does this mean for climate change? Thalassiosira pseudonana Image: http://www.genomenewsnetwork.org/resources/sequenced_genomes/genome_guide_p4.shtml