Planet of Slums
Mark Davis, a professor of history at the University of California, Irvine, is a self-described Marxist environmentalist. His work has stirred both controversy and acclaim. 
His 2006 book, Planet of Slums, examines the current state of global cities, using a recent U.N. habitat report, The Challenge of Slums, as its starting point. 
“By the report’s conservative accounting,” Davis explains, “a billion people currently live in slums and more than a billion people are informal workers, struggling for survival…the entire future growth of humanity will occur in cities, overwhelmingly poor cities, and the majority of it in slums.”
According to Davis, progressive urban planners advocate “hazard zoning” to exclude development and population from dangerous floodplains, swamps, unstable hillsides, fire-prone brush lands, and liquefaction zones.
“Capitalist urbanization in the Third World works exactly by the opposite principle: concentrating huge densities of poor, vulnerable people in the most unstable and hazardous sites.”
Nevertheless, he sees cities as the solution to the global environmental crisis: “Urban density can translate into great efficiencies in land, energy and resource use, whlie democratic public spaces and cultural institutions likewise provide qualitatively higher standards of enjoyment than individualized consumption and commodified leisure.”
David has often criticized well-to-do environmentalists for ignoring the problems of working people. To that end, he argues that activists should link every environmental demand to a specific proposal that improves quality of life in working class areas, whether this be higher employment or more park space.
