In vienne, central France, there is a long queue of cars in front of the expressway toll station. Worldwide, with the growth of the number and scale of cities, the waste gas, waste and sewage produced by these cities are destroying the surrounding environment crazily.

In Kenya, Kilimanjaro is located near the equator and is the highest mountain in Africa, with snow all year round. It has always been known as the "equatorial snow mountain". However, research shows that in 2007, due to the global temperature rise, the snow area on the top of the mountain decreased by 85% from 19 12. It is predicted that in 20 years' time, the last miraculous snow mountain on the equator will disappear.