How can slums save the planet?

Last updated on: February 23, 2010 at 1:07 pm by Desh Kapoor

How can slums save the planet? 2010-02-23T13:07:59-06:00 Desh Kapoor

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In 1983, architect Peter Calthorpe gave up on San Francisco, where he had tried and failed to organise neighbourhood communities, and moved to a houseboat in Sausalito, a town on the San Francisco Bay. He ended up on South 40 Dock, where I also live, part of a community of 400 houseboats and a place with the densest housing in California. Without trying, it was an intense, proud community, in which no one locked their doors. Calthorpe looked for the element of design magic that made it work, and concluded it was the dock itself and the density. Everyone who lived in the houseboats on South 40 Dock passed each other on foot daily, trundling to and from the parking lot on shore. All the residents knew each other’s faces and voices and cats. It was a community, Calthorpe decided, because it was walkable.

Building on that insight, Calthorpe became one of the founders of the new urbanism, along with Andrés Duany, Elizabeth Plater-Zyberk and others. In 1985 he introduced the concept of walkability in “Redefining Cities,” an article in the Whole Earth Review, an American counterculture magazine that focused on technology, community building and the environment. Since then, new urbanism has become the dominant force in city planning, promoting high density, mixed use, walkability, mass transit, eclectic design and regionalism. It drew one of its main ideas from the houseboat community.

There are plenty more ideas to be discovered in the squatter cities of the developing world, the conurbations made up of people who do not legally occupy the land they live on—more commonly known as slums. One billion people live in these cities and, according to the UN, this number will double in the next 25 years. There are thousands of them and their mainly young populations test out new ideas unfettered by law or tradition. Alleyways in squatter cities, for example, are a dense interplay of retail and services—one-chair barbershops and three-seat bars interspersed with the clothes racks and fruit tables. One proposal is to use these as a model for shopping areas. “Allow the informal sector to take over downtown areas after 6pm,” suggests Jaime Lerner, the former mayor of Curitiba, Brazil. “That will inject life into the city.”

The reversal of opinion about fast-growing cities, previously considered bad news, began with The Challenge of Slums, a 2003 UN-Habitat report. The book’s optimism derived from its groundbreaking fieldwork: 37 case studies in slums worldwide. Instead of just compiling numbers and filtering them through theory, researchers hung out in the slums and talked to people. They came back with an unexpected observation: “Cities are so much more successful in promoting new forms of income generation, and it is so much cheaper to provide services in urban areas, that some experts have actually suggested that the only realistic poverty reduction strategy is to get as many people as possible to move to the city.”

The magic of squatter cities is that they are improved steadily and gradually by their residents. To a planner’s eye, these cities look chaotic. I trained as a biologist and to my eye, they look organic. Squatter cities are also unexpectedly green. They have maximum density—1m people per square mile in some areas of Mumbai—and have minimum energy and material use. People get around by foot, bicycle, rickshaw, or the universal shared taxi.

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