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Photosynthesis global
Photosynthesis global
Photosynthesis global
Photosynthesis global
Photosynthesis global
Photosynthesis global
Photosynthesis global
Photosynthesis global
Photosynthesis global
Photosynthesis global
Photosynthesis global
Photosynthesis global
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Photosynthesis global

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  • 1. PhotosynthesisThe Big Picture
  • 2. Carbon cycle  Process by which carbon moves from organic t inorganic compounds and back  Producers convert inorganic carbon (CO2) into organic carbon compounds (glucose)  Primary Consumers obtain organic compounds by eating producers  Secondary consumers obtain organic carbon by eating primary consumers  Cellular Respiration by producers and consumers return CO2 to atmosphere
  • 3.  In the natural carbon cycle, there are two main processes which occur  Photosynthesis  metabolism
  • 4. Carbon in Ocean and Sediments CO2 is slightly soluble Can be absorbed into water Some of the dissolved CO2 remains in the water, the warmer the water the less carbon dioxide remains in the water Some CO2 is used by algae and phytoplankton through the process of photosynthesis Coral and shelled marine organisms take up CO2 from the water and convert it into calcium carbonate  When these organisms die pieces of shells/coral fall to ocean floor and make sediments The carbonate sediments are constantly being formed and redissolved in the bottom of the ocean Over long periods of time, the sediments may be raised up as dry land or into mountains This type of sedimentary rock is called limestone The carbonates can redissolve releasing carbon dioxide back to the air or water
  • 5. Humans and the Carbon Cycle Combustion of any type of fossil fuel, which may include oil, coal, or natural gas Fossil Fuels formed thousands of years ago from plant or animal remains that were buried, compressed, and transformed into oil, coal, or natural gas This carbon is said to be "fixed" in place and is essentially locked out of the natural carbon cycle Humans intervene during by burning the fossil fuels  During combustion in the presence of O2, CO2 and water molecules are released into the atmosphere
  • 6. Photosynthesis and Global Climate CO2 makes up 0.03 percent of Earth’s atmosphere  300 parts per million Greenhouse Effect  CO2 traps heat from sun in Earth’s atmosphere (otherwise it would escape into space)  Not a bad thing  Keeps world climate warm enough to sustain life  Keeps Earth 10% warmer than it would be without CO2 Currently CO2 in atmosphere is rising  360 parts per million Burning fossil fuels Deforestation Natural Causes  Photosynthesis  Cellular respiration  Decomposition  Volcanic eruptions  Ocean/limestone Global Warming  Overall rise in Earth’s average temperature over a period of time

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