Chapter 10 Key Objectives1.Understand past and current urban trends2.Understand the pros and cons of rapid urban

growth3.See cities as an ecosystem4.Understand zoning and its changing nature5.Understand the impact of development6.See the importance of infrastructure7.Comprehend the role of planning8.envision a sustainable city

Sustainable City

1. "development that meets the needs of the present without compromising the ability of future generations to meet their own needs.”

1. A sustainable city, or eco-city is a city designed with consideration of environmental impact, inhabited by people dedicated to minimisation of required inputs of energy, water and food, and waste output of heat, air pollution - CO2, methane, and water pollution. ...

1. "improving the quailty of life in a city, including ecological, cultural, political, institutional, social and economic components without leaving a burden on future generations. More..."

The Urban World

Chapter 10

A Growing and Changing Urban Space

Weeds: http://www.youtube.com/watch?v=2W6dOEdEAAQ&feature=related

2 Men and a Yak

Why are people moving to urban areas?

Urban Migration

1800 – 3% Urban1900 – 14% Urban / 12 cities with 1million people1950 – 30% Urban / 83 cities with 1million people2008 – 50% Urban / 400 cities & 19 with over 10million2050 – 70% UrbanUrban = in U.S. any place with more than 2,500 people

First Urban Revolution - 8000 to 2000 BC

Second Urban Revolution - 1700 to 1850

Third Urban Revolution began 1950 and continues today in developing nations

History of Urban Revolutions

Population and Urbanization

Urbanization Trends in US

What is a Megalopolis?

Urbanization Pros & Cons?

Age StructureGreater Number of MenPoverty & Homeless PeopleCrime RatesPollutionIncreased Heterogeneity

P.O.E.T

Population OrganizationEnvironmentTechnology

The Ecology of a City=

Population = numbers, age structure (age & sex) & ethnicityOrganization = economics, government, & social structureEnvironment = infrastructure & locationTechnology = aqueducts & traffic control

Elements of an Ecosystem

Population and Urbanization

Rush to urbanization in developing countries has led to:

• squatter settlements

Why should we be concerned?

Ramifications of Squatter Development1.Poor Sanitation

2.Crime3.Homelessness4.High Unemployment5.Disease

Speed of urbanization is key - why?

Urban Problems1. Land Use Patterns - sprawl or type of development2. Traditional Land Loss3. Flooding - location4. Brownfields - industrial waste5. Home Waste - disposal6. Sewage Treatment - 2/3 untreated in developing nations

cities7. Commute Times8. Urban Heat Islands

1. Megacities - 10 Million or more inhabitants2. Urban Agglomerations

9. Pollution - water (sewage), air (ground ozone & Energy Production), noise (traffic & agriculture)

1. Land Use - Georgia

2. Land Use- Agricultural Loss

3. Flooding

3. Flooding

4. Brownfields

Atlanta also has over 950 Brownfield sites within its boundaries.

Atlantic Station was built on the site of the old Atlantic Steel Mill. From 1901 through 1997, the Atlantic Steel Mill operated, employing as many as 2000 people. Today, Atlantic Station is known as the largest urban brown field redevelopment in the nation.

5. Sewage in Atlanta

A 19-square mile area of Atlanta, with Downtown as its center, is served by a combined sewer system.

In a combined system, a single large sewer pipe carries both sewage and stormwater to a water reclamation center for treatment.

Neighbors and available land for solid waste?

7. Commute Times

8. Atlanta’s Heat Island & Sprawl

http://www.treecoalition.org/uhi.htm

Impacts:Hotter = greater energy consumptionRunoff = increased

9. Atlanta’s Pollution