Preparation for global movement to urban regions requires a holistic study of infrastructure interactions. The impact of water and energy on one another has been studied to show how they are dependent upon one another. Other infrastructure interactions also are vital to designing more sustainable cities. The primary infrastructures are: water, energy, land use, and transportation. Creating more sustainable cities may involve low-impact development techniques, opting for compact living, and studying alternatives for water, energy, and transportation provision. Every city is different, and infrastructure decisions should be tailored to fit each city. This group is primarily focused on the greater Atlanta region and the Phoenix area.