World Environment Day reflects people's understanding and attitude towards environmental issues all over the world, and expresses human's yearning and pursuit for a beautiful environment. It is also one of the main media for the United Nations to promote global environmental awareness, pay more attention to environmental issues and take action.

20 19 World Environment Day was hosted by China, and the home match was held in Hangzhou. It will take "air pollution" as the theme, and the Chinese slogan is "Defend the blue sky, I am an actor".

The earth is the home of human beings and other species;

Because humans often adopt bad development methods such as deforestation and fishing, the speed of species extinction on the earth has been greatly accelerated. The trend of biodiversity loss is making the ecosystem slide to the critical point of irrecoverable. If the earth's ecosystem eventually deteriorates irretrievably, the relatively stable environmental conditions on which human civilization depends will no longer exist.

The United Nations Environment Programme (UNEP) selects its member countries to hold the "World Environment Day" commemoration on June 5th every year, and publishes the annual report on the state of the environment to commend the "Global Top 500". The theme of "World Environment Day" has been formulated in a targeted manner, collectively known as World Environmental Protection Day.