These are worrying signs the global warming but who does not know the beautiful images of reefs full of corals and fish. An increasing number of coral reefs, however, are affected by disease and acidification (and thereby reduced growth). The fish population in the reefs will increase as dramatically, a thousand times faster than normal, making the food for one billion people at risk. In recent years pile up the evidence is that global warming is the cause. A thousand times faster than normal.