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Greenhouse gases let the sun's light shine onto the Earth's surface, but they trap the heat that reflects back up into the atmosphere In this way, they act like the insulating glass walls of a greenhouse The greenhouse effect keeps Earth's climate comfortable Without it, surface temperatures would be cooler by about 33 degrees CelsiusStudents observe teacherled demonstrations, and build and evaluate simple models to understand the greenhouse effect, the role of increased greenhouse gas concentration in global warming, and the implications of global warming for engineers, themselves and the Earth In an associated literacy activity, students learn how a bill becomes law and they research global warming legislationIt is easy to make and you'll need about 40 CD cases to make a greenhouse illustrated in the picture above 2 Umbrella Greenhouse This creative greenhouse is very fun to make Just follow the simple tutorial to protect your plants from the exploitation of weather a...