Coral reefs are complex ecosystems made up of tiny coral polyps that provide shelter, food, and breeding grounds for a wide variety of marine life. They are incredibly diverse ecosystems, home to an estimated 25% of all marine species, and are essential for human well-being. However, coral reefs are under threat from human activities such as overfishing, pollution, and climate change. In this explainer, host Rakesh Kamal talks about Coral reefs, the impact of climate change on them, and the need to protect them.