How do leaves regulate the climate?

Renewing air: Forest photosynthesis absorbs CO2 and releases O2 at the same time, constantly renewing the air and maintaining the balance of O2 in the atmosphere.

Reduce the greenhouse effect: the green matter on the earth absorbs about 300 billion tons of carbon dioxide every year. Studies show that the global greenhouse effect is related to the reduction of forests and the increase of CO2 concentration, so increasing forest coverage can alleviate the greenhouse effect.

Sterilization and disinfection: Many trees can secrete phytoncide and kill germs. According to research, there are 20,000 to 30,000 bacteria in the air of city 1 m3, while there are only 30 to 300 bacteria in the air of L m3 in forest area.

Generation of ionized air: In the case of fresh air, negative oxygen ions are generated due to the action of cosmic rays during forest breathing, forming ionized air, which has good physical therapy effect. "Hundreds of why? In the book, this truth has long been included in the main reason why people living in mountains and beaches live longer.

Wind prevention and dust retention: the forest can effectively block sandstorms, and the forest belt can obviously reduce the wind speed within 25 times of the forest height; The total leaf area of each tree is 50-70 times of the crown area, and the branches and leaves can be used to block dust at the same time and restore the dust retention ability after rain.

Slow down noise: Urban noise is one of the eight ecological hazards in modern times, and a "noise room" appears, which affects people's mood, work and life. Forests and hedgerows can reduce noise, and urban forests and forest belts with a width of 30 meters can reduce noise LO- 15 dB.