Overfishing
The world faces a calamitous food crisis if we do not stop overfishing. About one billion people rely on fish as their primary
source of animal protein. There could come a time when we no longer have enough fish. The cause of this fish shortage is
overfishing. Overfishing occurs "when more fish are caught than the population can replace through natural reproduction,"
according to the World Wildlife Foundation.
Eighty-seven percent of all the world's fish stocks that we know about are at the "breaking point," according to the
Environmental Defense Fund (EDF). If the EDF is correct, many species of fish may be lost as a sustainable food source
forever, unless we change the way we fish the oceans. The Atlantic cod is one example. The cod was once one of the great food
resources on earth, but its numbers are now at an all-time low. The populations of other fish are also in danger of being lost as a
food source, including herring, Chilean sea bass, and blue fin tuna.
What is the theme of this passage?