Sustaining Terrestrial Biodiversity. Asim Zia Introduction to Environmental Issues EnvS 001, Spring 2007 Department of Environmental Studies San Jose State University. Chapter 10 Overview Questions. How have human activities affected the earth’s biodiversity?
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Introduction to Environmental Issues
EnvS 001, Spring 2007
Department of Environmental Studies
San Jose State University
Support energy flow and chemical cycling
Reduce soil erosion
Absorb and release water
Purify water and air
Influence local and regional climate
Store atmospheric carbon
Provide numerous wildlife habitats
Pulp to make paper
Fig. 10-4, p. 193
Effects of clear-cutting in the state of Washington, U.S.
Figures 10-10 and 10-11
Disrupts ecosystem processes
Destroys and fragments wildlife habitats
Leaves large openings
Increases water pollution, flooding, and erosion on steep slopes
Eliminates most recreational value
Higher timber yields
Maximum profits in shortest time
Can reforest with fast-growing trees
Short time to establish new stand of trees
Needs less skill and planning
Good for tree species needing full or moderate sunlight
Fig. 10-11, p. 198
• Oil drilling
• Flooding from dams
• Tree plantations
• Cattle ranching
• Cash crops
• Settler farming
• Not valuing
• Government policies
• Population growth
Fig. 10-19, p. 206
Sustaining Tropical Forests
Protect most diverse and endangered areas
Educate settlers about sustainable agriculture and forestry
Phase out subsidies that encourage unsustainable forest use
Add subsidies that encourage sustainable forest use
Protect forests with debt-for-nature swaps and conservation easements
Certify sustainably grown timber
Reduce illegal cutting
Slow population growth
Rehabilitation of degraded areas
Concentrate farming and ranching on already-cleared areas
Fig. 10-20, p. 207
What Can You Do?
Sustaining Terrestrial Biodiversity
• Adopt a forest.
• Plant trees and take care of them.
• Recycle paper and buy recycled paper products.
• Buy sustainable wood and wood products.
• Choose wood substitutes such as bamboo furniture and recycled plastic outdoor furniture, decking, and fencing.
• Restore a nearby degraded forest or grassland.
• Landscape your yard with a diversity of plants natural to the area.
• Live in town because suburban sprawl reduces biodiversity.
Fig. 10-27, p. 219