Watch NextWorld online: Episode 11 Future Megatropolis

In the future, will the Earth become one giant city? By the year 2050, it's projected that 75% of the population will be living in urban areas. And that number will go up further. But these future megacities will be radically different. They will generate their own power locally, without burning fossil fuels. Sky Farms will feed the urban population. And building surfaces will become digital, becoming a new form of interactive media. Roads and structures will be paved with miniature networked sensors, creating a city alive with computer intelligence. New construction techniques will allow instant cities to spring up where none existed before. We'll even develop entire cities that can float on the seas. But perhaps the biggest megacities will be the ones inside our computers, as more people commute to work in the Virtual World

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