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UC Berkeley physicist Richard Muller and others were looking at the so-called urban heat island effect - the notion that because more urban temperature stations are included in global temperature data sets than are rural ones, the global average temperature was being skewed upward because these sites tend to retain more heat. Hence, global warming trends are exaggerated. Using data from such urban heat islands as Tokyo, they hypothesized, could introduce "a severe warming bias in global averages using urban stations." In fact, the data trend was "opposite in sign to that expected if the urban heat island effect was adding anomalous warming to the record. The small size, and its negative sign, supports the key conclusion of prior groups that urban warming does not unduly bias estimates of recent global temperature change."

"Researchers at Yale, Texas A&M and Boston University predict that by 2030 urban areas will expand by more than 463,000 square miles, or 1.2 million square kilometers. That is equal to 20,000 American football fields becoming urban every day for the first three decades of this century. The growth in urban areas will coincide with the construction of roads and buildings, water and sanitation facilities, and energy and transport systems that will transform land cover and cities globally. Recent estimates suggest that between $25 trillion and $30 trillion will be spent on infrastructure worldwide by 2030, with $100 billion a year in China alone."

In urban communities, less than 1 in 100 inhabitants died from Spanish flu in 1918, but in isolated communities up to 9 out of 10 died. An important explanation for the differences is due to different exposure to influenza in the decades before the Spanish flu came. Those living in urban communities probably had a higher degree of pre-existing immunity that protected against illness and death in 1918 than those living in very isolated rural areas. This is shown in a new study from the Norwegian Institute of Public Health.

More than one billion urban residents will face serious water shortages by 2050 as climate change worsens effects of urbanization, with Indian cities among the worst hit, a study said Monday.

Scientists at the University of Miami Rosenstiel School of Marine & Atmospheric Science have discovered a technique to track urban atmospheric plumes thanks to a unique isotopic signature found in vehicle emissions.

Vegetation in towns and cities can make a significant contribution to carbon storage and, ecologists say, could lock away even more carbon if local authorities and gardeners planted and maintained more trees. The study, published this week in the British Ecological Society's Journal of Applied Ecology, is the first to quantify how much carbon is stored in vegetation within an urban area of Europe.

A survey by the National Association of Realtors conducted in March 2011 revealed that 62 percent of people ages 18-29 said they would prefer to live in a communities with a mix of single family homes, condos and apartments, nearby retail shops, restaurants, cafes and bars, as well as workplaces, libraries, and schools served by public transportation.  A separate 2011 Urban Land Institute survey found that nearly two-thirds of 18 to 32-year-olds polled preferred to live in walkable communities. Younger Americans are also using technology to substitute for driving, connecting with friends and family online, substituting Facebook, Twitter, Skype, or FaceTime interactions for in-person visits and using online shopping and e-commerce in place of driving to and from grocery and retail stores, the report notes. For generations of Americans, car ownership was an almost mandatory rite of passage-a symbol of freedom and independence. For more and more young people today, a car is a burden they no longer wish to carry. 

A San Francisco State University biologist has released the initial results of her nationwide citizen science project to count bee populations and has found low numbers of bees in urban areas across America, adding weight to the theory that habitat loss is one of the primary reasons for sharp declines in the population of bees and other important pollinators.

Elizabeth Demaray, an associate professor of fine arts, is cultivating lichen on the sides of New York City skyscrapers to counteract the lack of native vegetation found in the city. Her "Lichen for Skyscrapers Project" was featured as part of New York's Art in Odd Places Festival from Oct. 1-10 and is currently on view as a site-specific installation on 14th Street between Union Square Park and the Hudson River. "Metropolitan centers figure into local temperatures in an interesting way," Demaray says. "They are sometimes referred to as 'urban heat islands' because they create heat and they trap heat. A large part of this process is due to the materials that we build with and the actual architecture of the buildings that we create." Demaray says one of the ways to reduce heat in these cities is to cultivate lichen, which forms a protective barrier, insulating its supporting building from harmful elements. It can lower cumulative temperatures by absorbing sunlight and reflecting heat due to its light color palate while making oxygen and creating green space on the sides of buildings.

New research focusing on the Houston area suggests that widespread urban development alters wind patterns in a way that can make it easier for pollutants to build up during warm summer weather instead of being blown out to sea.

In the next 20 years, more than 590,000 square miles of land globally - more than twice the size of Texas - will be gobbled up by cities, a trend that shows no signs of stopping and one that could pose threats on several levels, says a Texas A&M University geographer who is part of a national team studying the problem.

Megacities offer the enticing prospect of employment and the benefits of an urban infrastructure - but they also expose their inhabitants to high levels of air pollution. Together with an Indian Partner Group of the Max Planck Institute for Chemistry in Mainz, Bhola Ram Gurjar is analyzing this pollution and how badly it is affecting the health of city dwellers.

Large increases in urbanization can lead to more concrete and asphalt reducing an area's flood mitigation services. Low density housing, however, has little effect on flood mitigation services but does cut down losses in the amount of land available for food and carbon storage, the study showed. Researchers investigated how a projected 16 per cent increase in the human population in Britain by 2031 would affect key ecosystem services depending on how cities expanded to meet the growing demand.

The Purdue Solar Racing team's solar-powered urban commuter car achieved the equivalent of almost 2,200 miles per gallon in the 2011 Shell EcoMarathon international competition this week in Houston.

Climate scientists have told city planners that based on current trends, Chicago will feel more like Baton Rouge than a Northern metropolis before the end of this century. So, Chicago is getting ready for a wetter, steamier future. Public alleyways are being repaved with materials that are permeable to water. The white oak, the state tree of Illinois, has been banned from city planting lists, and swamp oaks and sweet gum trees from the South have been given new priority. Thermal radar is being used to map the city's hottest spots, which are then targets for pavement removal and the addition of vegetation to roofs. And air-conditioners are being considered for all 750 public schools, which until now have been heated but rarely cooled.

More than half the world's population live in cities, many of which are increasingly vulnerable to the impacts of climate change. But cities are also emerging as the innovative "first responders" in dealing with climate change, says a major new report led by researchers at Columbia University and the City University of New York (CUNY) and published by Cambridge University Press.

In a bit of technical wizardry, students from the University of Adelaide, Australia, have devised and built an electric diwheel, that with modification, could possibly solve inner city transportation problems. The team, comprised of 14 mechanical engineering students, has taken the idea of a diwheel and quite literally, turned it on its head, and in the process have created a vehicle that could be used to safely transport people around; all with a minimum amount of energy.

The explosive growth of cities worldwide over the next two decades poses significant risks to people and the global environment, according to a meta-analysis published today in Plos One.

There is a vitally important national and state-level discussion taking place about how to address the government's frighteningly large deficits while limiting disruptions for all Americans. But while federal and state actions affect us all, much of what concerns Americans most directly and personally happens closer to home and increasingly, this means in our cities. Budget cuts simply can't derail efforts to make our cities smarter. Today our nation's cities are facing a "perfect storm." For many cities, their populations are growing at the same time that their budgets are shrinking. Today, for the first time, more than 50% of the world's population lives in cities. In the last decade large metropolitan areas in the U.S. grew by a combined 10% - nearly double the rate of the rest of the country. Our large metro areas now house two thirds of America's total population. They have become the dominant forces in our economy and society.

Back in 2009 Mayor Bloomberg prohibited vehicle traffic on Broadway between 42nd Street and 47th Street in Times Square to create a pedestrian plaza (video here). Now, the city's most recent Community Air Survey found that, "After the conversion to a pedestrian plaza, NO pollution levels in Times Square went down by 63 percent while, NO2 levels went down by 41 percent." Unlike N2O, which makes you laugh at Phish shows, NO2, or nitrogen dioxide, destroys your lungs and may cause Sudden Infant Death Syndrome. Nitric oxide (NO) isn't good for you either.