National Committee for America 2050. 2011.

America 2050 is a national initiative to meet the infrastructure, economic development and environmental challenges of the nation as we prepare to add about 130 million additional Americans by the year 2050. America 2050 is guided by the National Committee for America 2050, a coalition of regional planners, scholars, and policy-makers to develop a framework for the nation's future growth. A major focus of America 2050 is the emergence of megaregions - large networks of metropolitan areas, where most of the population growth by mid-century will take place. America 2050 is serving as a clearinghouse for research on the emergence of megaregions and a resource for megaregion planning efforts nationwide. Its aim is to advance research on the emergence of this new urban form while promoting planning solutions to address challenges that span state and regional boundaries, demanding cooperation and coordination at the megaregion scale.

http://www.america2050.org/about.html