Allow me to make two closely related points. The first is more general, and the second one that follows from it is more specific.
First, the more general one. We've gotten to the absurd point where the simple act of moving our bodies around has become a major consumer of fossil fuels and contributor to greenhouse gas emissions in the United States (to say nothing of our petro-shenanigans in the Middle East). For reasons too complicated to recite here, it was decided several decades ago that we should ensconce ourselves in several hundred pounds of metal, glass, and rubber and rely on petroleum-burning motors to move said inert poundage and ourselves around at high speeds (at least ideally, like in the commercials). Aside from minor additions such as seat belts and cup holders, this is still the basic configuration for how most people in this country go to and from work, school, errands, church, and weekend getaways.
There was a moment over thirty years ago when this peculiar way of moving ourselves around came into question, at least in some quarters. Back in the 1970s, in the midst of the Arab oil embargo and the "energy crisis" that ensued, a lot of new ideas were being proposed: not just cars with higher gas mileage, but solar panels, better insulation, geodesic dome houses. Some of these ideas were acted upon, many were not. When oil got risibly cheap again in the 1980s and 1990s, most Americans went back to driving everywhere (actually more than before) in gas-guzzling cars.
But in the midst of the "energy crisis" of the 1970s, a public intellectual, Ivan Illich, came at it from a singularly novel perspective. The following is an extended passage from Illich's Energy and Equity (1974):
The discussion of how energy is used to move people requires a formal distinction between transport and transit as the two components of traffic. By traffic I mean any movement of people from one place to another when they are outside of their homes. By transit I mean those movements that put human metabolic energy to use, and by transport that mode of movement that relies on other sources of energy....The product of the transportation industry is the habitual passenger. He has been boosted out of the world in which people still move on their own, and he has lost the sense that he stands at the center of his world. The habitual passenger is conscious of the exasperating time scarcity that results from daily recourse to cars, trains, buses, subways, and elevators that force him to cover an average of twenty miles a day, frequently criss-crossing his path within a radius of less than five miles. He has been lifted off his feet... The habitual passenger is caught at the wrong end of growing inequality, time scarcity, and personal impotence, but he can see no way out of this bind except to demand more of the same: more traffic by transport. He stands in wait for technical changes in the design of vehicles, roads, and schedules; or else he expects a revolution to produce mass rapid transport under public control....The habitual passenger cannot grasp the folly of traffic based overwhelmingly on transport... He has lost the power to conceive of himself outside the passenger role. Addicted to being carried along, he has lost control over the physical, social, and psychic powers that reside in man's feet. The passenger has come to identify territory with the untouchable landscape through which he is rushed. He has become impotent to establish his domain, mark it with his imprint, and assert his sovereignty over it.
I bring up the distinction Illich drew between transit and transport as a way to preface my second, more specific point: an alternative transport movement going on right here in sunny Santa Cruz. The Citizens for Personal Rapid Transit, or cPRT, are pushing for a solar-powered, computerized, semi-personal moving pod system. I have heard the PRT advocates speak at several eco-shindigs around town, and I was impressed by the vigor with which they pursued their cause. As far as I'm concerned, almost anything is better than the car-centered system we have now, so I applaud their efforts heartily. But I fear they are symptomatic of a much larger and deeply held assumption: habitual passengerhood. If unchallenged, it will hamstring any sane approach to traffic and urban design. Should we be spending the limited resources we have on perpetuating our dependence on motorized transport, or should we prioritize human-powered transit?
Much of the discussion about "green" alternatives to our current car dependence overlooks an obvious point: we can build our towns and cities around muscle-powered traffic. Humans had been doing it for millennia before cars came along. Actually, there are two obvious points: many of these towns and cities are perfectly nice places to live. Indeed, tourists burn ungodly quanta of fossil fuels flying across the planet simply to photograph them and try out the local cuisine. But there's no secret to their success: they were built at the human scale. Everything else--the pleasant public squares, small shops, walkable neighborhoods, public art, neat truck farms and countryside minutes from downtown--followed from the need to build a living arrangement around the limited reach of the human body.
Rather than have tourists ruin the "authentic feel" of places like Venice, Siena, and Salzburg by virtue of their sheer crushing mass, why not allow our own native urban spaces to follow the logic of the human scale? Then perhaps people wouldn't have such a pressing desire to escape from the ugliness and hectic pace in their own little corner of the world. If our towns and cities became places to dwell in, and not just to move through, then perhaps people would start seriously investing in comely urban amenities rather than, say, yet another trip to the big city or multimillion-dollar bond measure to expand the highway system. Before you know it, we would have hundreds of charming towns and cities to rival Venice, Siena, and Salzburg. Most of our population could actually be living in them!
Don't get me wrong: there's clearly an important place for motorized modes of transport. Rail, automobiles, busses, trams, etc. all have their place in a civilized mode of living. This would especially be the case for farming and bulk goods transport, long-distance travelers, and the ill or infirm. Now that we know about these technologies, we should use them. I see no reason from an environmental perspective why we can't employ them, where appropriate, for the foreseeable future. But their place has to be a peripheral one in the overall urban scheme. Even if we were to somehow devise an ingenious carbon-neutral "green" replacement for our fossil-fueled transportation system, it wouldn't address the basic fact that desirable urban spaces require a certain density of activity that is best and most cheaply attained by building around the limits of the pedestrian's foot and the bicycle's pedal. We should see climate change and Peak Oil as yet more reasons among many for reshaping our built environment around the time-tested principles of the human scale, not for trying out the latest techno-utopian phantasma that would keep us imprisoned in a web of motorized transport.
I'll close with a relevant quote from Leopold Kohr's The Breakdown of Nations (1957!):
Cars seem thus to have brought us less satisfaction than a good old steed or pair of sturdy shoes brought our forefathers. However, one may say, cars and other highly efficient means of modern transportation such as tubes or bus services are no longer a luxury to satisfy our travel wants. They have become a necessity to satisfy our basic needs. That is quite true. But since when is the creation of new necessities a sign of progress?