Lesson 10 - Lesson 10 The Carbon Cycle-Photosynthesis(CO2...

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Lesson 10 The Carbon Cycle -Photosynthesis (CO2 + H2O = glucose & oxygen) Decay (reverse that) Climate Change - Climate Change is the preferred term to describe the rapid changing of the climate that we (the planet) are experiencing mainly since the 1900's. It is related to global warming. -Global Warming is the increase in temperature (generally) that has been occurring mainly since the 1900s -Not all the areas of the planet are likely to experience a warming, some areas will experience a cooling and so climate change is the preferred terminology -The greenhouse effect is a highly beneficial process where the planet is warmed by greenhouse gases helping to trap some of the radiation that would have otherwise escaped back into space. Without the greenhouse gases the surface temperature of the planet would be an average –18 °C (0 °F)! -Greenhouse Gases are gases (in the atmosphere) that will absorb infrared radiation. Naturally released greenhouse gases include: water (H 2 O), carbon dioxide (CO 2 ), methane (CH 4 ) & nitrous oxide (N 2 O). UV will penetrate the atmosphere and a portion will be absorbed by the surface of the planet Where is the CO2 coming from? -Carbon emissions are from the energy intensive operations, mostly electric utilities and transportation contributing 2/3 or 66% of the emissions -The utility industry is a prime contributor as well as transportation. Utilities are easier to impact as there are far fewer utility plants than vehicles (500 coal fired utilities, 106 or so nuclear utilities etc.) You also get much more carbon dioxide from coal than you do from the other fossil fuels so coal-fired utilities are an obvious point source of carbon dioxide CO2 Levels -Recall the carbon cycle had both photosynthesis and decay occurring, so in the Spring when plant life is growing the CO 2 concentration falls, during the Fall and Winter the decay process dominates and the CO 2 concentration increases. The Southern hemisphere is mostly water and so the summer/winter activities in the northern hemisphere dominate What about the Temperature?
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