The Great Barrier Reef is near Australia. It is the biggest coral reef. Scientists feel much worry. The weather event El Nino is very strong. It warms the water.
Warm water gives corals stress. The corals lose tiny colorful algae. The algae give the corals color. Without algae the corals turn white. This is called coral bleaching.
Warm water makes corals die. This harms the eco system. Many animals live in the reef. Experts fear a loss of many species.
The reef is 2300 kilometers long. It is Unesco world nature heritage. Researchers ask for help from the government. We must protect the climate better.
