Playa del Carmen, located on the eastern coast of Mexico's Yucatan Peninsula, is a popular destination for scuba divers due to its proximity to the Mesoamerican Barrier Reef, the second-largest barrier reef in the world. Unfortunately, like many coral reefs around the world, the Mesoamerican Barrier Reef is under threat from climate change, overfishing, pollution, and other human activities. As a scuba diver in Playa del Carmen, it's important to understand the threats facing the coral reef and what you can do to help conserve it.