Answer and Explanation:
After looking at the image carefully, I truly and humbly think you should change your answer. This image does not concern lack of fish. Notice how small is the block of ice on which the polar bear stands is. It's certainly about global warming. Therefore, in order to help you rewrite your answer, I'll provide you with a paragraph:
The cartoon in which a polar bear stares at its own reflection sends a powerful message without using any words. The bear is standing on a tiny block of ice, which can barely fit its four paws, and its reflection in the water is a skeleton. These two details draw attention to global warming and its devastating effects. Polar bears may very well become extinct once their habitat no longer exists due to the polar caps melting. What we see in the image is the bear staring at its own future - death is what awaits ahead, if man does nothing to prevent it. I believe the image is shocking because it puts together present and future, showing the bear as it is now, showing how the world is already changing, and showing what is about to happen. Even though we know about it, seeing it drawn this way, the skeleton staring back at the bear, conveys a sense of urgency and sadness.