In response to state laws and federal incentives, cities and metropolitan areas across the country are engaged in “sustainability planning” aimed at reducing greenhouse gas emissions. In many if not most cases, this planning seeks to reshape urban areas to reduce the amount of driving people do. In general, this means increasing urban population densities and in particular replacing low-density neighborhoods in transit corridors with dense, mixed-use developments.
Topic:
Climate Change, Development, Energy Policy, Infrastructure, and Governance
The administration has likened President Obama's high-speed rail plan to President Eisenhower's Interstate Highway System. Yet there are crucial differences between interstate highways and high-speed rail. First, before Congress approved the Interstate Highway System, it had a good idea how much it would cost. In contrast, Congress approved $8 billion for high-speed rail without knowing the total cost, which is likely to be at least $90 billion.
Proponents of compact development argue that rebuilding American urban areas to higher densities is vital for reducing greenhouse gas emissions. Compact city policies call for reducing driving by housing a higher percentage of people in multi-family and mixed-use developments, reducing the average lot sizes of single-family homes, redesigning streets and neighborhoods to be more pedestrian friendly, concentrating jobs in selected areas, and spending more on mass transit and less on highways.
Far from protecting the environment, most rail transit lines use more energy per passenger mile, and many generate more greenhouse gases, than the average passenger automobile. Rail transit provides no guarantee that a city will save energy or meet greenhouse gas targets.