The Great Barrier Reef is like the biggest underwater home for thousands and thousands of different kinds of funny-looking fish, corals, and other creatures. But, sometimes, the water and the homes of these creatures can get polluted or hurt in some way. That's what we call environmental threats.
One of the main problems that the Great Barrier Reef is facing is called global warming. Just like we feel hot when we sit in the sun for too long, the waters around the reef are also getting warmer. When the water is too warm, it can make the coral very sick and cause them to lose their bright beautiful colors. Sometimes the coral can even die!
Another threat is something called pollution. This happens when people throw trash, chemicals, or waste into the ocean. The water around the reef can get too dirty and it can hurt the creatures living there. It can also make it hard for the coral to grow or survive.
Lastly, there is something called overfishing. This is when people catch too many fish from the reef, and the creatures have a hard time growing and finding food. Some people also fish in ways that are not safe or good for the reef.
All these environmental threats can hurt the Great Barrier Reef and the creatures that live there. It's important to remember that we all need to take care of the reef and its inhabitants, so that it can continue to be a beautiful and vibrant home!