1. Latin America and the Environment

2. Areas Where Humans Impact the Environment Water Air and Climate Landforms Plats and Animals Solid Waste Disposal July 22, 2012Footer text here2

3. Water July 22, 2012Footer text here3

4. Water Avaliability Much of Latin America has rich water resources Mexico: Lake Chapala Largest body of freshwater Lost 80% of its intake water since mid-70s Most water is diverted for irrigation Mexico City sank 9 meters during the 20 th century due to ground water removal. Rio Grande and Colorado River Currently Mexico is in water debt due to lack of water in the Rio Grande Problem due to dams, drought, and irrigation divergence Creates tension between US and Mexico

5. Regional Water Scarcity July 22, 2012Footer text here5

6. Water Quality Water pollution: when water is modified by one+ substances so that it cannot be used for a specific purpose (or that it is less suitable than before). Large populations  increased water pollution Agriculture: Fertilizers, biocides, animal waste Industry Mining Heap-leach gold mining (Peru) involves using large amounts of cyanide to extract gold, waste products are then dumped into rivers. Mercury Mining (Brazil, Venezuela, and neighbors) involves using large amounts of mercury to extract gold, waste products are then leached into the Amazon Municipalities/Residences: detergents, landfills,sewage Mexico City treats less than 10% of its waste water. Sewage  rivers  farmland for irrigation Leading cause of childhood deaths: diarrhea and water-related diseases (e.g. cholera and typhoid) July 22, 2012Footer text here6

7. Percentage of Population with Reasonable Access to Safe Drinking Water 2004 Data Reasonable access to safe drinking water is defined as the availability of at least 20 litres per person per day from an improved source within 1 kilometer of the user's dwelling. July 22, 2012Footer text here7

8. Percentage of Households in Major Cities Connected to Water and Sewers 2004 Data 90% of the developing world's waste water is still discharged untreated into local rivers and streams. July 22, 2012Footer text here8

9. Air and Climate

10. Sources of Air Pollution Transportation: 55% Stationary fuel combustion (power plants, factors, etc.): 21% Industrial Processes: 16% Misc.: 6% Solid Waste Disposal: 2% 1.1 billion people live in urban areas with unhealthy air (this is worse now!) Mexico City is particularly at risk In Mexico City and Santiago, Chile pollution exceeds WHO heath standards 300 days/yr 1993 Data

11. Types of Air Pollution Acid Rain Photochemical Smog: nitrogen oxides+water  ozone More common in warm dry climates with low air circulation (aka Mexico City) Primary sources: motor vehicles and industries Damage lungs; increase asthma, bronchitis, pneumonia, and emphysema; damages vegetation Ozone Depletion July 22, 2012Footer text here11

12. Deaths Attributable to Urban Air Pollution 2004 Data World Health Organization July 22, 2012Footer text here12

13. Landforms

14. How Humans Affect the Land Excavation: canals, reservoirs, mines Open-pit mining: iron, copper, sand, gravel, and stone Surface mining: removes vegetation, topsoil, and rocks Dumping Surface Depressions Guatemala City Mexico City Contributed to earthquake damage Urban areas suffer much more impact than rural: much of Latin America is almost pristine, parts are almost fully transformed Implications on plants and animals?

15. Plants and Animals

16. How do humans affect organisms? Latin America is home to major biodiversity hot spots Lots of unique species and under high risk of disruption 100’s of plants and animals go extinct each year! Causes of organism extinction Habitat destruction/changes: farming, logging, mining, municipality development Consumption: unsustainable hunting, fishing Aggravated by modern technology Exotic species: shipping, traveling, purposeful introduction Invasive species leave their natural predators and now have an advantage over local species Diseases Contamination: biocides, industrial and agricultural run-off Biocides  disease resistant strains, which disrupts natural food chain

17. 25 Biodiversity Hot Spots All of Central America and the Caribbean are identified as a biodiversity hot spot! July 22, 2012Footer text here17

18. Status of soil degradation around the world 1990 Data Over the past 40 years, approximately 30% of the world's cropland has become unproductive

19. Protecting Biodiversity Laws Convention on Biological Diversity (1992): 189 countries signed as of 2007 Convention on International Trade in Endangered Species (1973): 160 countries signed as of 2007 How do we get multiple countries to agree? Who has rights to animal/plant resources? Nongovernmental Organizations (NGOs) Works with governments, people, and private companies to contribute to their effort E.g. The Nature Conservancy: purchases critical habitats, Greenpeace: petition government officials to improve legislation, World Wildlife Fund July 22, 2012Footer text here19

20. Solid-Waste Disposal

21. Why Waste? Trash lasts a long time! We study life in ancient Rome through their trash More people+more money=more trash Types of waste Municipal Waste: the stuff you put in your garbage cans Second largest expenditure of most local governments in the U.S. (4.5 lbs/person/day) According to WiseGeek, Mexico produces 30% more trash than the U.S. Hazardous Waste: material that may pose a substantial threat to human health or environment if improperly handled Note: things like paint thinners, computers, bleach, used motor oil, weed killer technically aren’t hazardous waste

22. Municipality Waste Disposal Landfills: “S anitary Landfills” waste deposited into trenches, compacted, covered with soil, repeat. Lack of standards Produces leachate (rain+trash) which is usually toxic Most are not large enough Recycling Source reduction: produce less waste Recycling: recover and reprocess used material Limitations: 1) Expensive to collect recycling 2) Cost for products vary, 3) Less market for recycled goods Pros: highly practiced in poor developing countries (e.g. Mexico City): individuals collect recycling and then sell it to middlemen, but highly dangerous to the individual Incineration: burning Contributes to toxic air pollution and toxic ash Can be okay, but needs lots of filtration/scrubber systems Can be used to generate electricity Ash goes to landfills July 22, 2012Footer text here22

23. Hazardous Waste Disposal Sources: chemical and oil industry Usually dumped/buried  groundwater issues Other infrequently used methods: incineration, infrared heating, bacterial decomposition Radioactive Waste E.g. Nuclear power plants, but companies that make things like plastics and smoke alarms generate radioactive waste too! Much is put in landfills, significant sources (power plants) are usually stored in pools or in sealed containers and sunk or buried Hanford, Washington…and it’s leaking… Many foreign companies dump in the ocean July 22, 2012Footer text here23