Every year, hundreds of thousands of acres of natural land are paved over with concrete, asphalt and other impervious materials. Too often, the full extent of the threat this poses for us and our environment is ignored. It's time to start taking it seriously.
From sports fields and playgrounds to the great unspoiled wildernesses of our national parks, many of the natural lands that have escaped development have only been able to do so thanks to a federal program working in the background to support land conservation across the United States.
