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Cities21 researches and advocates reduced driving, smart growth, new mobility, PRT, and behavior change. Cities21 has created a number of advanced concepts that all work together to create "efficient cities." Efficient cities lower the cost of living, cut driving in half to protect the climate, make places more vibrant, improve local government finances, enable more biking/walking to improve health, increase happiness by increasing social connections, and reduce land consumption at the fringe of civilization. You'll find more than 400 pages of research explaining these concepts on this web site..