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The average surface temperature on Earth is slowly increasing This trend is known as global warmingOn Earth, the major greenhouse gases are water vapor, which causes about 36–70 percent of the greenhouse effect (not including clouds);Students 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 activ 26 6 The Greenhouse Effect The Atmosphere Siyavula Model greenhouse effect drawing