Lecture%202%20answers

Lecture%202%20answers - Answers to study questions Lecture...

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Answers to study questions Lecture 2, Ecosystem services 1. What are the major ecosystem services that can be described as “provisioning” – i.e., things that humans harvest from ecosystems? Which of these services are currently increasing, and which are decreasing? Answer: Provisioning ecosystem services are perhaps the most tangible to us. They include the following: 1. Food (animal and plant agriculture, as well as harvests of natural populations). Currently food production is increasing (even faster than the human population is growing), due to increases in the total amount of land being farmed, the yield per unit area of land under production, and increases in farming of animals. 2. Fresh water. Total supply is decreasing due to overexploitation in many areas. Quality of water available is also declining due to pollution. 3. Wood used for building structures, and fiber used for clothing. Supply is relatively stable and sustainable in many areas. 4. Biofuels (including wood, and potentially new biofuels for producing ethanol
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This note was uploaded on 04/22/2011 for the course BIS 2B taught by Professor Strong during the Winter '08 term at UC Davis.

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Lecture%202%20answers - Answers to study questions Lecture...

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