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Tragedy of the Commons

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willow sutton

on 30 January 2014

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Transcript of Tragedy of the Commons

Tragedy of the Commons
What is the Tragedy of the Commons?
An economic problem in which every individual tries to reap the greatest benefit from a given resource. As the demand for the resource overwhelms the supply, every individual who consumes an additional unit directly harms others who can no longer enjoy the benefits. Generally, the resource of interest is easily available to all individuals.
Coral Bleaching
Midway Island
Almost exactly halfway between Asia and North America lies a small, remote island. One of the most prevalent things that Midway Island is known for is the incredible number of albatross that nest on the island. The creatures that depend on Midway have been in peril for many years due to human activity encroaching on the health of the ecosystems of the island.

Tuna Fish and Over Fishing
For many fish species, there is a terrible threat from overfishing. Overfishing is defined as when commercial or non-commercial fisheries catch so many adult fish that the remaining population is not able to produce enough offspring to keep stable numbers.

Ocean Acidification
Coral Reefs
temperature change
water acidification
Causes of Coral Bleaching
Today coral reefs are suffering from serious erosion, depletion, and lack of nutrients due to the tragedy of the commons.
What is happening to the Tuna?
How are the Tuna being affected?
The tuna fish are being over fished and undergoing substantial losses. Just in the span of 10 years the tuna has gone from catching 200,000 tons/year to 1 million tons/year. Also the tuna are endangered and still being fished due to the lack of enforcement.
The Great Pacific Garbage Patch
The Pacific Gyre is one of the largest gyres in the world. This gyre is located very close to Midway Island, and annually deposits tons of plastic wastes onto the shores of the island.
The Bluefin Tune, a fish prized for its' taste and coveted for sushi, has come under siege from large scale fishing operations. With unsustainable fishing tactics, and no limits on the amount of fish allowed to be captured, the world stock of these monstrous fish has plummeted dramatically.
Get into groups of 3 groups of 4 and one 3
You will have twice the tuna fish as people in the ocean
Each person will have their own fishing straw in order to get tuna fish
You will fish for 1 minute, this will represent 1 year
After a minute is up the current population of fish will double
You keep fishing minute by minute until there are no more tuna fish
Place your caught tuna fish on the napkins in the appropriate section
For each tuna fish caught you will receive candy for at the end
The maximum carrying capacity of your ocean is 16 or 12 for the group of 3
<-tuna fish
fishing straws->
Full transcript