Majora Carter grew up in the South Bronx. Now she's back, with a mission: to lead her community out of poverty and fight environmental injustice by bringing green-collar jobs to the area.
These mini ecosystems can insulate buildings and cool cities -- and the Germans love them.
Is a city within a city the stuff of disturbing science fiction or a force for architectural good?
Guerrilla gardeners turn areas of urban neglect into spaces of horticultural majesty.
Cities are evolving but are they the only solution for affordable housing?
Streets filled with empty homes and uncut grass could be the future for American suburbs.
Every metropolis has its own personality: which one are you? Find out in our quiz.
The world's informal cities are places of hope and potential for the future urban world
Tomorrow's purpose-built cities are shiny paragons to environmentalism.
Jaime Lerner, former Brazilian mayor, on how he started an urban revolution.
With floods hitting cities across the globe, are floating houses the answer?
The green spaces atop disused railways and tucked underneath interstates.
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To boldly grow Can we grow food in space?
Solar solution Could the whole world go solar?
Facebook 2.0 Are virtual worlds the next step?
Beam me up! Are we close to teleportation?
Curing cancer Can we make cancer history?
Internet mobs Angry bloggers exert justice
