There is a much deeper crisis at work as well, a crisis in the creation of goods and services that underlies money to begin with, and it is this crisis that gave birth to the real estate bubble everyone blames for the current situation. To understand it, let's get clear on what constitutes a "good" or a "service." In economics, these terms refer to something that is exchanged for money. If I babysit your children for free, economists don't count it as a service. It cannot be used to pay a financial debt: I cannot go to the supermarket and say, "I watched my neighbor's kids this morning, so please give me food." But if I open a day care center and charge you money, I have created a "service." GDP rises and, according to economists, society has become wealthier.

The same is true if I cut down a forest and sell the timber. While it is still standing and inaccessible, it is not a good. It only becomes "good" when I build a logging road, hire labor, cut it down, and transport it to a buyer. I convert a forest to timber, a commodity, and GDP goes up. Similarly, if I create a new song and share it for free, GDP does not go up and society is not considered wealthier, but if I copyright it and sell it, it becomes a good. Or I can find a traditional society that uses herbs and shamanic techniques for healing, destroy their culture and make them dependent on pharmaceutical medicine which they must purchase, evict them from their land so they cannot be subsistence farmers and must buy food, clear the land and hire them on a banana plantation -- and I have made the world richer. I have brought various functions, relationships, and natural resources into the realm of money. In The Ascent of Humanity I describe this process in depth: the conversion of social capital, natural capital, cultural capital, and spiritual capital into money.

Essentially, for the economy to continue growing and for the (interest-based) money system to remain viable, more and more of nature and human relationship must be monetized. For example, thirty years ago most meals were prepared at home; today some two-thirds are prepared outside, in restaurants or supermarket delis. A once unpaid function, cooking, has become a "service". And we are the richer for it. Right?

Another major engine of economic growth over the last three decades, child care, has also made us richer. We are now relieved of the burden of caring for our own children. We pay experts instead, who can do it much more efficiently.

In ancient times entertainment was also a free, participatory function. Everyone played an instrument, sang, participated in drama. Even 75 years ago in America, every small town had its own marching band and baseball team. Now we pay for those services. The economy has grown. Hooray....

Unlike mass transit, podcars carry two to 10 passengers, giving travelers the freedom and privacy of their own car while reducing the use of fossil fuels, reducing traffic congestion and freeing up space now monopolized by parking.

At stations located every block or every half-mile, depending on the need, a rider enters a destination on a computerized pad, and a car would take the person nonstop to the location. Stations would have slanted pull-in bays so that some cars could stop for passengers, while others could continue unimpeded on the main course.

"It works almost like an elevator, but horizontally," said Roberts, adding podcar travel would be safer than automobile travel.

The podcar is not entirely new. A limited version with larger cars carrying up to 15 passengers was built in 1975 in Morgantown, West Virginia, and still transports West Virginia University students.

Next year, Heathrow Airport outside London will unveil a pilot podcar system to ferry air travelers on the ground. Companies in Sweden, Poland and Korea are already operating full-scale test tracks to demonstrate the feasibility. Designers are planning a podcar network for Masdar City, outside Abu Dhabi, which is being built as the world's first zero-carbon, zero-waste city.

Meanwhile, more than a dozen cities in Sweden are planning podcar systems as part of the country's commitment to be fossil-fuel-free by 2020, said Hans Lindqvist, a councilman from Varmdo, Sweden, and chairman of Kompass, an association of groups and municipalities behind the Swedish initiative.

"Today's transportation system is reaching a dead end," said Lindqvist, a former member of the European parliament....