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With a vision and a strategy the 21st century city will be green, a healthy place for all and will generate zero net pollution. This book offers a vision and a strategy. Productive urban landscapes have two huge challenges to address: CO2 emissions are projected to increase by two-thirds in the next 20 years, and as the global food production increases so does the number of people going hungry, with the number of urban hungry soaring. The symbiotic relationship between a productive landscape and the human settlement system is as old as civilization. During the past 200 years that millennium-old positive relationship deteriorated into a further.