Greenhouse - The name given to gasses that trap heat and cause global warming., Organic - The term given to food sold in supermarkets and grown or fed without synthetic fertilizers, chemicals,hormones, and antibiotics., Topsoil - This important layer of dirt is essential for ensuring plant growth and its nutrients are retained by trees., Fossil Fuels - The type of fuel humans depend on most. It is nonrenewable and found underground., Natural Gas - The cleanest fossil fuel, most often found in fragile areas of nature., Sustainable - Living within the limits of earth’s natural resources., Renewable Energy - Energy that can be used and reused an infinite number of times., Deforestation - The cutting down of trees in a large area; the destruction of forests by people., Reduce-Reuse-Recycle - The three “R”s that offer a guide to helping you lessen your impact on the environment and create a more sustainable world., Solar Energy - The most abundant energy source capable of being harnessed by humans., Ecosystem - An interdependent community of organisms including plants, animals, water, air and the ground., Ozone Layer - The part of the earth’s atmosphere that repels the sun’s ultraviolet rays., Ecological Footprint - A tool used to illustrate how much impact a human being has on the Earth., Fuel Cell - It combines Hydrogen and Oxygen to create energy that can be used in cars., Methane - The most toxic greenhouse gas emission. It is common around landfills and farms.,

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