1. Cities and sustainability
reminder: what is sustainability?

2. welcome 2 make up classes still needed
This week - Wednesday or Friday?
or, since we need to add another 90 minutes, we can add 15 minutes to the next 6 classes

3. Cities…
⁃ 3.6 billion people of the 7.0 billion world population live in urban areas, and this urban population is projected to increase to 6.3 billion in 2050 (while the world population will be 9.3 billion).
⁃ cities in the world account for between 71% and 76% of global carbon dioxide (CO2) emissions

4. Let’s think together Break into teams.
What are the indicators for a sustainable city? What are the questions that need to be asked?
Think: environmental, social, economic, governmental
Take notes, choose a rep, and report back to the class.

6. Beirut 0.8 square meters of public green space / person
WHO recommends a minimum of 9 square meters / person
Beirut is 50 times less than recommended

7. Sustainable city?
Kennedy et al. (2007): a sustainable city can only be one for which the in ow of material and energy resources, and the disposal of wastes, do not exceed the capacity of the city’s surrounding environment. In other words, for achieving environmental sustainability urban consumption must match or be below what the natural environment — such as forests, soil and oceans — can provide, and the resulting pollutants must not overwhelm the environment’s ability to provide resources to humans and other members of the ecosystem.

14. please see / read the readings provided on the blog

15. chapter 22

16. living in urban areas
Urbanization: the creation and growth of urban and suburban areas; measured as the % of people in a country, or in the world, living in such areas
Urban growth: rate of increase of urban populations
1st cities: 6,000 years ago. … Today, ½ of the world’s population live in urban areas
growth by natural increase and by immigration, mostly from rural areas

17. 4 major trends in urban population dynamics
Proportion of global population living in urban areas is increasing; could reach 66% by 2030; 88% of growth in already overcrowded and economically stressed cities
Numbers and sizes of urban areas are mushrooming. Every week: 1 million people. Megacities - cities w/ 10 people or more
Urban growth is much slower in more developed countries; more-developed at 75% urbanization - to reach 81% by 2030
Poverty is increasingly urbanized. 1 billion people in lees- developed countries live in slums

18. 1609 …

19. some undesirable impacts of urban sprawl
Land and biodiversity
loss of cropland & loss and fragmentation of forests, grasslands, wetlands and wildlife habitat
Water
increased use and pollution of surface water and groundwater; increased runoff and flooding
Energy, air and climate
increased energy use and water; increased emissions of carbon dioxide and other air pollutants
Economic effects
decline of downtown business districts; more unemployment in central cities

20. any advantages? centers of development … centers of services …
recycling may be more feasible; may preserve biodiversity … ; may save energy …
how?

21. any disadvantages
intense population pressure and high population densities
huge ecological footprints
urban population occupy about 2% of the earth’s area - but consume about 75% of its resource and produce 75% of the world’s climate changing carbon dioxide
- for your information
[read the core case study of Curtiba, Brazil]

22. most cities
lack vegetation [and the vegetation could absorb air pollution give off oxygen, provide shade, reduce soil erosion, provide habitat]
have water problems [water demands increase; reservoirs and canals built; deeper wells drilled; depriving rural and wild areas, and depleting underground water supplies]
concentrate pollution and health problems [plus can increase spread of infectious diseases]
excessive noise [prolonged exposure to sound levels above 85 dbA]
affect local climates [warmer, rainier, foggier, cloudier than rural areas. why? generate more heat - create urban heat island]
cause light pollution [sea turtles…]

23. urban heat island

25. What to do about slums / shanty-towns?
“Should squatters living in or near cities by given title to the land they live on?”

26. Transportation? Cities can grow outward or upward
outward with cheap gasoline, highways, plentiful land
US: 4.6% of world’s population and ⅓ of the world’s vehicles; use 43% of the world’s gasoline
motor vehicles
1.2 million deaths a year (3,300/day); 50 million animals
congestion … outdoor air pollution
reducing car usage
car sharing … bikes… mass transit rail… buses…

27. land-use planning
zoning: parcels of land are designated for certain uses
height restrictions; property tax;
Beirut: finance/real-estate/higher-regulation

28. making cities sustainable?
walkability
mixed-use and diversity
quality urban design
smart transportation
— cities for people not for cars

29. major urban resource and env problems