TAILIEUCHUNG - Weather & Climate P2

1) Begin class in the dark today. If possible, close blinds and turn off lights. Ask students if they know where their electricity comes from. Is it from a coal-fired power plant? Hydro-electric? Wind energy? Is the plant nearby? Have this discussion in the dark. 2) Turn on the lights and point out the ease with which the room was supplied electricity. Where does the power originate? Explain that students will investigate this today in class. | impacts associated with building a hydroelectric plant including hydrologic changes water quality degradation and blockage of fish migration routes. Solar energy comes from the sun. Using solar panels or other technologies the sun s rays are converted to electrical energy. Atmospheric conditions and the solar panels positions on the earth relative to the sun can affect the amounts of solar power collected. Wind energy generates electricity from the wind. Wind energy reduces greenhouse gas emissions when it offsets or takes the place of a fossil fuel power plant. Wind energy s negative environmental impacts can include impacts on migrating birds or bats and aesthetic impacts on neighbors. Biofuels Biomass These are solids liquids or gases from recently dead biological materials most commonly plants. Biomass refers more specifically to the solids from recently dead biological materials. Firewood is an example of biomass used for energy. Fuel from sugar crops sugar cane or starch crops corn is called ethanol fuel from non-edible plant sources like wood or grass is chemically identical but called cellulosic ethanol. Ethanol is used as a supplement to gasoline in cars. Vegetable oil can be used as a fuel but usually just in cars with older diesel engines under specific climate conditions. While burning biomass and biofuels does produce some air pollution it has less impact on climate change than burning fossil fuels because of its shorter carbon cycle. Fossil fuels are made from plants and animals that have been dead and stored underground for many millennia thus the name fossil fuel. Without human intervention fossil fuels would continue to store or sequester carbon preventing it from entering our atmosphere. Plants grown for biomass and biofuels are active components of the carbon cycle taking up carbon while growing and releasing carbon when burned or decomposed. Unlike fossil fuels biofuels can be re-grown quickly providing food corn sugar and timber and taking up .

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