Environment Affecting Humans Environment & Resource Management www.CraigMarlatt.com/school
Environment Affecting Humans • Human Health at Risk • A Lack of Forests • Climate Change • Water, Water, Everywhere?!
Human Health at Risk • Greenhouse Effect • Smog
Smog in Hangzhou, China Smog in Toronto, Canada
A Lack of Forests • Road washouts • Erosion of farmlands • Watershed • Foods • Medicines
Food in the Rainforests • At least 80% of the developed world's diet originated in the tropical rainforest. Its bountiful gifts to the world include fruits like avocados, coconuts, figs, oranges, lemons, grapefruit, bananas, guavas, pineapples, mangos and tomatoes; vegetables including corn, potatoes, rice, winter squash and yams; spices like black pepper, cayenne, chocolate, cinnamon, cloves, ginger, sugar cane, tumeric, coffee and vanilla and nuts including Brazil nuts and cashews.
Medicine in the Rainforest • As the rainforest species disappear, so do many possible cures for life-threatening diseases. Currently, 121 prescription drugs sold worldwide come from plant-derived sources. While 25% of Western pharmaceuticals are derived from rainforest ingredients, less that 1% of these tropical trees and plants have been tested by scientists.
Climate Change 1. Increased warming 2. Differing regional impacts 3. Vulnerable ecosystems 4. Widespread water concerns 5. Secure food supply 6. Near-term increase in forest growth 7. Increased damage in coastal and permafrost areas 8. Adaptation determines health outcomes 9. Other stresses magnified by climate change 10. Uncertainties remain and surprises are expected
Thermohaline Circulation • Temperature and salinity differences in the world's oceans work together to create thermohaline circulation (see diagram). • This circulation pattern, acts as a "conveyor belt," slowly overturning the oceans. The strength of the circulation is strongly determined by the sinking of the waters associated with the Gulf Stream. • This releases heat into the atmosphere, keeping Europe warm.
WaterScarcity • Water scarcity occurs when the amount of water withdrawn from lakes, rivers or groundwater is so great that water supplies are no longer adequate to satisfy all human or ecosystem requirements • Scarcity is likely to occur sooner in regions where the per capita availability of water is low to start with, and with high population growth.