"There is a window of opportunity" to enlist urban design to slow global warming, said Karen Seto, a professor at Yale University who co led a chapter about city planning in a 2,000 page IPCC report about slowing climate change.
Problems include a lack of planning regulations, especially in developing nations, where opportunities for limiting future greenhouse gases are highest and which could also benefit from curbs on fossil fuels to reduce air pollution.
That expansion works out at 110 sq kms (42 sq miles) every day for three decades, almost twice the size of Manhattan or 20,000 American football fields.
report last week by the Institute for Transportation and Development Policy said that urban projects such as London's Central Saint Giles, Hammarby Sj in Stockholm and Liuyun Omega Seamaster 70s
"20,000 football fields will go from being farms to cities, from being forests to cities, every day," Seto told Reuters. And urban areas account for between 71 and 76 percent of the world's carbon dioxide emissions from energy, it said.
In 1800, only Beijing had more than a million inhabitants and cities and towns were home to three percent of the world population. By 2010, 449 cities had more than a million inhabitants and 52 percent of all people lived in urban areas.
The IPCC's summary said that swifter action is needed to limit global warming to an agreed ceiling of 2 degrees Celsius (3.6 Omega Seamaster Co-axial Chronometer 150m 500ft
Once built, cities can be hard to shift to greener policies. "If you live in the average North American city you are a long way from buying a loaf of bread or where you work and you have to use a car," Seto said.
City growth by almost 2 Manhattans a day said key to climate
Fahrenheit) above pre industrial times, seen as a threshold for ever more damaging heatwaves, floods and rising seas.
More compact city designs that cut commutes, insulation to save energy, better public transport, cycle lanes and pedestrian areas can all cut emissions, mainly from fossil fuels.
study showed on Monday.
In one scenario, urban expansion from 2000 to 2030 will add 1.2 million sq kms (460,000 sq miles) to towns and cities, mostly in Asia and Africa and more than the total Omega Seamaster Wrist Shot urban land in 2000 of about 650,000 sq kms (250,000 sq miles), it says.
Xiaoqu in Guangzhou, China, were good examples of low emissions developments.
"Each week the global urban population increases by 1.3 million," the chapter said. By 2050, the urban population is likely to rise to about two thirds of everyone on Earth.
A previous IPCC report in September said the probability that human emissions of greenhouse gases, rather than natural variations in the climate, were the dominant cause of warming since 1950 had risen to at least 95 percent from 90 percent previously.
A 33 page IPCC summary with a photo of Shanghai on the cover was issued on Sunday. It said yet to be built cities could help slow warming but most details are in a 116 page chapter, obtained by Reuters before publication on Tuesday.
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