A study of 1997 put the value of the services of the whole biosphere at about 33 trillion US…
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A study of put the value of the services of the whole biosphere at about trillion US dollars a year. Take the global gross national product of that time as trillion dollars. Take the soil formation as of the value, and climate regulation as of the value. (The shares are from the earlier edition of NCERT, and the method of such studies is debated.)
- What is the value of soil formation, in trillions of dollars a year?
- What is the value of climate regulation? Give the answer to two decimals.
- How many times is the total value of the global gross national product? Give the answer to one decimal.
Need a reminder? The key ideaShow
and . Assimilation efficiency is assimilated divided by ingested. Net production efficiency is production divided by assimilated. Ecological efficiency is the production of a level divided by that of the level below.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Total . Global product . Soil formation . Climate regulation . All in trillions of dollars a year.
Plan. Take the shares of . Divide by .
Step 1. (a) trillion dollars.
Step 2. (b) trillion dollars.
Step 3. (c) times.
Answer: trillion; trillion; times.
Check. A single supporting service, soil formation, is worth about half of the total.
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