Early people hunted wild animals for food. The invention of agriculture meant that people raised animals like cows and pigs for food instead. How can this kind of change be applied to fishing? What evidence is there that this change is already happening?

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

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