The focus of much dialogue and debate in the public eye over climate change and greenhouse gas emissions (GHGs) tends to focus on industrial emissions of pollution for manufacturing or the production of electricity. Emissions from transportation sources (like trains, planes, and automobiles) and from the heating, cooling, and lighting of buildings themselves are less readily visible, yet each constitutes roughly a third of America's total greenhouse gas emissions.

The federal public lands—national forests, parks, and rangelands—are widely known for their vast natural resources: timber; range; minerals; watersheds; wildlife; and sweeping vistas of incredible beauty and diversity. No less notable are the cultural resources found on the public lands. Some of the earliest withdrawals of public lands from homesteading or other disposition occurred because of their cultural and historic importance.

There can be no sustainable development without sustainable transportation. It is an essential component not only because transportation is a prerequisite to development in general but also because transportation, especially our use of motorized vehicles, contributes substantially to a wide range of environmental problems, including energy waste, global warming, degradation of air and water, noise, ecosystem loss and fragmentation, and desecration of the landscape. Our nation's environmental quality will be sustainable only if we pursue transportation in a sustainable way.