The observations starkly reverse assumptions by some scientists that fast-growing urbanization and the efficiencies of global trade might eventually slow or reverse tropical deforestation. The study, which covers most of the world’s tropical land area, appears in this week’s early edition of the journal Nature Geoscience.
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Deforestation has been a rising concern in recent decades, especially with the recognition that it may exacerbate climate change. Studies in the late 20th century generally matched it with growing rural populations, as new roads were built into forests and land was cleared for subsistence agriculture. Since then, rural dwellers have been flooding into cities, seeking better living standards; 2009 was recorded as the first year in history when half of human lived in urban areas. Large industrial farms have, in turn, taken over rural areas and expanded further into remaining forests, in order to supply both domestic urban populations and growing international agricultural markets, the study suggests.

“The main drivers of tropical deforestation have shifted from small-scale landholders to domestic and international markets that are distant from the forests,” said lead author Ruth DeFries, a professor at the Earth Institute’s Center for Environmental Research and Conservation. “One line of thinking was that concentrating people in cities would leave a lot more room for nature. But those people in cities and the rest of the world need to be fed. That creates a demand for industrial-scale clearing.”

DeFries and her colleagues analyzed remote-sensing images of forest cover across 41 nations in Latin America, Africa and Asia from 2000-2005, and combined these with population and economic trends. They showed that the highest forest losses were correlated with two factors: urban growth within countries; and, mainly in Asia, growth of agricultural exports to other countries. Rural population growth was not related.

In recent years, tropical countries have been supplying growing amounts of palm oil, soybeans, sugar, meat and other processed products to distant markets abroad. Not all the products are used for food; palm oil and sugar in particular are also being converted into biofuels. Furthermore, said DeFries, as small farmers within tropical nations move away to become city dwellers, they may actually use more resources from the countryside, not less. This is because those living in cities have higher incomes—the reason most moved there to begin with—and thus tend to consume more processed foods and animal products. Pastures needed to produce meat, and large plantations and other facilities that turn out other products, in turn, require land. “Collectively, these results indicate a shift from state-run road building and colonization in the 1970s and 1980s to enterprise-driven deforestation,” says the study.

Hot spots of industrial-scale clearing include Brazil, Indonesia and Cambodia—countries that, unlike many others, still have considerable forests left to clear. The trend has not reached some forested parts of Latin America, such as Surinam or Guyana, which also have large tracts of remaining forest. Almost 60% of remaining forests occur in areas where net agricultural trade, percent of products exported, and urban growth are all relatively low. But as demand for products grows, these areas are likely to see increased pressure, the study says. According to projections by the United Nations, nearly all population growth in the next 40 years will take place in cities, and some two-thirds of people will live there by 2050.

DeFries said that some initiatives aimed at halting deforestation need to be quickly shifted. For instance, some policies that focus on getting small landowners to conserve forests—a popular mechanism among governments and nonprofits at the moment—“may not be all that productive without a focus on large-scale clearing as well,” she said. “Governments will have to look at policies that intensify yields on existing high-yield fields—not clear more land,” she said.

The other authors of the study are Columbia University ecologist Maria Uriarte; ecologist Thomas Rudel of Rutgers University; and Matthew Hansen of South Dakota State University.

Turfgrass lawns help remove carbon dioxide from the atmosphere through photosynthesis and store it as organic carbon in soil, making them important “carbon sinks.” However, greenhouse gas emissions from fertilizer production, mowing, leaf blowing and other lawn management practices are similar to or greater than the amount of carbon stored by ornamental grass in parks, a UC Irvine study shows.
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These emissions include nitrous oxide released from soil after fertilization. Nitrous oxide is a greenhouse gas that’s 300 times more powerful than carbon dioxide, the Earth’s most problematic climate warmer.
“Lawns look great – they’re nice and green and healthy, and they’re photosynthesizing a lot of organic carbon. But the carbon-storing benefits of lawns can be counteracted by greenhouse gas emissions,” said Amy Townsend-Small, Earth system science postdoctoral researcher and lead author of the study, forthcoming in the journal Geophysical Research Letters.

The research results are important to greenhouse gas legislation being negotiated. “We need this kind of carbon accounting to help reduce global warming,” Townsend-Small said. “The current trend is to count the carbon sinks and forget about the greenhouse gas emissions, but it clearly isn’t enough.”

Turfgrass is increasingly widespread in urban areas and covers 1.9 percent of land in the continental U.S., making it the most common irrigated crop.

In the study, Townsend-Small and colleague Claudia Czimczik analyzed grass in four parks near Irvine, Calif. Each park contained two types of turf: ornamental lawns (picnic areas) that are largely undisturbed, and athletic fields (soccer and baseball) that are trampled and replanted and aerated frequently.

The researchers evaluated soil samples over time to ascertain carbon storage, or sequestration, and they determined nitrous oxide emissions by sampling air above the turf. Then they calculated carbon dioxide emissions resulting from fuel consumption, irrigation and fertilizer production using information about lawn upkeep from park officials and contractors.

The study showed that nitrous oxide emissions from lawns were comparable to those found in agricultural farms, which are among the largest emitters of nitrous oxide globally.

In ornamental lawns, nitrous oxide emissions from fertilization offset just 10 percent to 30 percent of carbon sequestration. But fossil fuel consumption for management, the researchers calculated, released almost as much or more carbon dioxide than the plots could take up, depending on management intensity. Athletic fields fared even worse, because – due to soil disruption by tilling and resodding – they didn’t trap nearly as much carbon as ornamental grass but required the same emissions-producing care.

“It’s unlikely for these lawns to act as net greenhouse gas sinks because too much energy is used to maintain them,” Townsend-Small concluded.

Previous studies have documented lawns storing carbon, but this research was the first to compare carbon sequestration to nitrous oxide and carbon dioxide emissions from lawn grooming practices.

The UCI study was supported by the Kearney Foundation of Soil Science and the U.S. Department of Agriculture.

About the University of California, Irvine: Founded in 1965, UCI is a top-ranked university dedicated to research, scholarship and community service. Led by Chancellor Michael Drake since 2005, UCI is among the most dynamic campuses in the University of California system, with nearly 28,000 undergraduate and graduate students, 1,100 faculty and 9,000 staff. Orange County’s largest employer, UCI contributes an annual economic impact of $3.9 billion.

News Radio: UCI maintains on campus an ISDN line for conducting interviews with its faculty and experts. Use of this line is available for a fee to radio news programs/stations that wish to interview UCI faculty and experts. Use of the ISDN line is subject to availability and approval by the university.

Urban LivingUrban areas are equipped with all the modern amenities. The modern-day facilities like the Internet, telephone, television and satellite communication facilities are widely available in the urban areas. A majority of the households of the urban areas are blessed with this technological advancement.The newly developing shopping complexes, theatres, food malls and restaurants are a commonplace in urban cities. Huge constructions, large housing complexes, skyscrapers are found in most of the urban metropolitan cities. Elevators, escalators, storeyed parking areas and towering constructions add to the magnificence of the urban cities.
Due to a greater availability of all the modern facilities along with an increase in the number of educational facilities and career opportunities, people of the urban areas lead an economically more stable and a luxurious life.

The increasing attraction of the people towards the urban parts of the world has resulted in crowding of urban areas. The increasing population, majority of which prefers settling in urban cities, has led to an imbalance in the density of human population. Excessive industrialization has invited environmental problems like pollution.

However, the rise in economic growth that has resulted in self-sufficiency in the common masses has resulted in a self-centered nature of society. While technological advancement has brought the world closer, human beings have gone far apart from each other. Buildings that touch the skies have built walls between people. The rise in prosperity has been eclipsed by the decline in peace.
Rural Living

Rural areas are not crowded with concrete constructions all over. Houses are rather widely spaced with ample room for fields and gardens. Rural areas are some of the only areas fortunate enough to house the greens. People in rural areas live in close proximity of nature. Apart from people, there is room for pets and grazing animals that help maintain equilibrium in nature.

Due to a relatively lesser number of people inhabiting the rural areas, the rural parts are not overcrowded by people. These areas are blessed to have least amounts of pollution. Due to afforestation and ample space for plantations, rural areas have managed to maintain an environmental balance. Pollution is less also on accounts of very less number of industries in rural areas.

The stress that results from a fast life in the urban areas is not a part of the peaceful and relatively slow paced life of the rural regions. The life may not be as lavishly led as that in the urban areas, but the people there are generous and their hearts have room for emotions. Rural are the ones where humanity is still alive.

Every coin has two sides to it. While the rural living is deprived of luxury and technology, it is rich in terms of its relationship with ‘nature’. The urban life is update in terms of technology and career prospects. However, the falling humane qualities and a disrupted environmental balance shadow the bright future of urban living.