Really?
A new study finds that population growth is "key reason" for urban sprawl. Well, yeah. Kidding aside, the study from the Center for Immigration Studies looks to have some important data in it. Here's the first few bits of the press release:

In recent years, a host of local governments, states, and non-profit organizations have adopted initiatives designed to save rural land from sprawl. Most anti-sprawl efforts have focused on "Smart Growth" strategies, which emphasize better planning to create more efficient land use. A new study from the Center for Immigration Studies indicates that this approach will have only limited success in saving rural land because it fails to address a key reason for sprawl - immigration-driven population growth. Based on data from the Census Bureau and from the U.S. Department of Agriculture's Natural Resources Conservation Service, the study finds that about half the loss of rural land in recent decades is attributable to increases in the U.S. population, while changes in land use account for the other half. The 122-page report, entitled Outsmarting Smart Growth: Population Growth, Immigration, and the Problem of Sprawl, contains detailed information for every state and will be available on line at www.cis.org.

I'll watch for it.