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Read the excerpt from “The Threat to Coral Reefs” section of Coral Reefs. Corals have bright beautiful colors, but their colors aren't all their own. Most corals are actually pale, and the colors we see come from the algae that live inside them. When corals are under stress, they expel their algae and lose their color. Without algae, most corals will eventually die. This is called coral bleaching and it's becoming more and more common in the worlds' reefs. Corals are fragile creatures and they face many threats that cause them to bleach and otherwise imperil their survival. Some threats are natural, such as hurricanes. Others are human-made, such as pollution and over-fishing. The biggest threat to reefs today is rising levels of greenhouse gases, caused in part by the burning of fossil fuels. These gases are causing the world's oceans to warm up and become more acidic. Water that is too warm causes coral bleaching, and water that is too acidic makes it very difficult for corals to build their skeletons. These threats are global, so the damage isn't isolated to a few corals here and there—every coral in the world, and all the animals that depend on them, are in danger. What is the effect of greenhouse gases on coral reefs? Responses