Sustainable designer Bill McDonough told the audience of his plans for green cities in China, and Alex Steffen showed flowers that bloom red petals if they are growing above mines.
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Successful Green Cities: Examples of cities undertaking sustainable practices in specific sectors, such as energy supply, buildings, transportation, water and waste, but are there cities that are taking an integrated approach greening multiple sectors concurrently?
What advances in planning, engineering and design can help to green future cities?
They also encourage the destruction of valuable green space within cities, such as playing fields, allotments and gardens.
The green roof market alone grew by 115% last year, according to Green Roofs for Healthy Cities, a not-for-profit organization touting the benefits of turf roofing.
Kentucky cities of Bowling Green, Elizabethtown, Glasgow, Radcliff and Bardstown are among the first to experience significantly faster data speeds on their wireless devices as a result of the network launch.
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New Cities: As urbanization as a process accelerates can policy and planning in new cities leap-frog environmental, social and economic negatives of current cities to create green and sustainable living environments?
With a little more encouragement, what once was an eccentric way to roof your home could soon become the universal standard, turning our cities into lush, green metropolises.
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And he's planning to push municipalities to use renewable energy, citing a recent survey that identified 76 Japanese cities with enough energy from green sources to meet local demand.
Last year, Newport councillors called for a green belt in Cardiff to keep the two cities separate.
In retrospect, the meal that heralded the new green cuisine now sprouting up in most major European cities was one I had 20 years ago, at chef Pietro Leemann's Joia, in Milan.
Salt Lake City has just joined several other cities that offer free metered parking for all green vehicles.
But green initiatives aren't just found on blueprints for new cities.
Green belts are a way to control the growth of towns and cities by protecting the countryside that encircles them.
And when that industry shrank and so many jobs were lost, who could have guessed that Pittsburgh would fare better than many other Rust Belt cities, and reemerge as a center for technology and green jobs, health care, and education?
But its cofounders Michael Budman and Donald Green are talking up fares within Canada and to major U.S. cities that will be as much as 35% lower than prices on Air Canada.
Other avant-garde gardening clubs operate in cities like Paris, Berlin, Tokyo and New York, where the Green Guerrillas, one of the first guerrilla groups, was founded by artist Liz Christy in 1973.
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Whereas similarly well-placed cities in the south-east such as Oxford or Guildford are restrained by green belts and Byzantine planning processes, these places embrace developers.
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Cutting crime in the cities would end the "exodus to the countryside" and ease pressures on the green belt.
Replacing concrete with porous pavement, employing green roofs and rain barrels, restoring creeks and wetlands, and increasing tree cover can help cities absorb rain water rather than funnel it to sewer systems.
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Cities like Seattle are joining with others around the world and taking on goals for green development, while states like Colorado are passing bond initiatives for transit and new requirements for clean energy.
The numbers, however, suggest that poor Mancunians and Liverpudlians eat just as few green vegetables as poor Glaswegians (Glasgow also smokes and binge-drinks less than the other two cities).
In 1935 London's regional planners proposed the Metropolitan Green Belt and the 1947 Town and Country Planning Act encouraged local authorities to protect the land around towns and cities from building.
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