Environmental protection and sustainable development are common concerns of mankind. 1972 The Declaration on the Human Environment adopted by the first United Nations Conference on the Human Environment put forward the slogan "There is only one earth" and designated June 5th of each year as World Environment Day.

June 5th, 2023 is the 50th World Environment Day. This year's slogan is "Reduce Plastic, Pick Up Plastic", and China's theme is "Building a Harmonious Life between Man and Nature". The significance of World Environment Day is to remind the world of the harm of the earth and human activities to the environment.