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Unformatted text preview: we breathe. Forest trees effectively provide shade and store water, keeping an
area cool and humid even during hot, dry spells. Forests therefore exert a strong control on local climate.
Finally, forests provide wood, which has many unique qualities that make it a versatile and irreplaceable
resource used for fuel, in construction, and in the arts. The timber industry is an important part of the global
economy, accounting for roughly 1% of world gross domestic product (GDP), about U.S. $200 billion
annually xiv. Roughly 1.6 billion people depend on forests for their livelihoods, and about 300 million people
live in forests xv.
Wood is a valuable and renewable resource. However, trees are treated as a nonrenewable resource in
most parts of the world, and they are being harvested at an unsustainable rate. Deforestation is a decrease in
the stock of wood, a renewable resource, that results from harvesting timber faster than it regrows, an
16 1/20/2011 Chapter One: Principles
unsustainable practice (Meadows, Randers et al....
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This note was uploaded on 01/08/2014 for the course SUST 510 taught by Professor Marker during the Fall '14 term at Black Hills State University.
- Fall '14