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The main idea: the effects of ______1_______ changes on _____2______ I. The impact of increasingly smaller families A. A greater demand for _____3______ B. A shortage of _____4____ C. People solving the problem by forming ____5___ II. The impact of ______6______ A. Some people moving back to ___7___ B. Many seeking homes that cost ____8_____ C. Some homes built ____9____ D. Other houses getting their energy from the sun III. The impact of the economy/economic factors A. _______10______ due to inflation B. _______11______ for housing loans