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SUSTAINABLE YIELD
J. VOYTILLA
WHAT IS SUSTAINABLE YIELD?
WHAT IS SUSTAINABLE YIELD?
 “Yield” has a few different meanings. Here are
some:
1. to give or render as fitting, rightfully owed, or
required
2. to give up possession of on claim or demand
3. to produce as return from an expenditure or
investment
4. to give place or precedence : acknowledge the
superiority of someone else
WHAT IS SUSTAINABLE YIELD?
 According to page 12 of Living in the Environment, Miller:
The highest rate at which a renewable resource
can be used indefinitely without reducing its
available supply is its sustainable yield.
 For example, the annual sustainable yield for a
given crop may be estimated simply as the
annual gain in biomass or energy through growth
and recruitment.
CALCULATING SUSTAINABLE YIELD
TRY IT OUT YOURSELF!
CHANGING ATTITUDES
 Consider the development of changing attitudes to
sustainability and economic growth, since the Rio
Earth Summit (1992) leading to Agenda 21.
1. What is Agenda 21 and specifically Chapter 14 all
about?
2. What organizations/committees are involved and what
are their roles?
3. What benefits can you identify that have been obtained
by Agenda 21?
4. Any negatives?
5. Research this in teams and prepare to take a position
and defend it!

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Sustainable yield copy

  • 3. WHAT IS SUSTAINABLE YIELD?  “Yield” has a few different meanings. Here are some: 1. to give or render as fitting, rightfully owed, or required 2. to give up possession of on claim or demand 3. to produce as return from an expenditure or investment 4. to give place or precedence : acknowledge the superiority of someone else
  • 4. WHAT IS SUSTAINABLE YIELD?  According to page 12 of Living in the Environment, Miller: The highest rate at which a renewable resource can be used indefinitely without reducing its available supply is its sustainable yield.  For example, the annual sustainable yield for a given crop may be estimated simply as the annual gain in biomass or energy through growth and recruitment.
  • 6. TRY IT OUT YOURSELF!
  • 7. CHANGING ATTITUDES  Consider the development of changing attitudes to sustainability and economic growth, since the Rio Earth Summit (1992) leading to Agenda 21. 1. What is Agenda 21 and specifically Chapter 14 all about? 2. What organizations/committees are involved and what are their roles? 3. What benefits can you identify that have been obtained by Agenda 21? 4. Any negatives? 5. Research this in teams and prepare to take a position and defend it!

Editor's Notes

  1. 60+15 – 55-10= 75-65=10