Yes, large-scale bleaching of coral reefs is usually caused by higher than normal seawater temperature. High temperature will be toxic to the "yellow algae" born in corals. Yellow algae not only provide food for corals, but also make coral reefs show gorgeous colors through photosynthesis.

When algae on coral reefs leave or grow at low density, corals will die because of lack of nutrition. According to the data of Global Coral Reef Monitoring Network, the bleaching problem in 1998 led to the extinction of 16% coral reefs.

On lizard island in northern Queensland, corals turn brown:

Prove that the surrounding algae have been destroyed. According to a survey conducted by the World Wide Fund for Nature, 93% of the 2,300 km coral in the Great Barrier Reef has been albino, and a large-scale albino phenomenon has killed nearly 22% of the coral.

Richard Lake, a spokesman for the World Wide Fund for Nature, said: "Some people think that white coral is beautiful, but in fact, it is a kind of destruction of biodiversity."