It's #WorldOzoneDay! The ozone layer is a thin protective shield that keeps us safe by absorbing most of the sun's ultraviolet rays. ... <看更多>

#WorldOzoneDay · Earth without ozone is like a house without roof. It is the only thing that protects the earth from the harmful UV rays of the sun. This World ... ... <看更多>

Climate change refers to long-term shifts in temperatures and weather patterns, mainly caused by human activities, especially the burning of ... ... <看更多>