Green plants can lower the temperature and increase the humidity of the environment. Which of the following factors is closely related to the role of green plants in regulating climate? ( )

Except for a small part of water absorbed by roots from soil, most of it is lost to the atmosphere through transpiration. Plants lose water through transpiration, which can reduce the temperature of plants and prevent them from being burned by sunlight in hot summer. At the same time, the transpiration of plants also reduces the temperature of the surrounding environment of plants, which is also the reason why it is commonly said that "it is good to enjoy the cool under a big tree". Furthermore, the transpiration of plants increases the humidity of the air and the amount of clouds in the sky, thus increasing the precipitation; Secondly, the transpiration tension formed by plant transpiration promotes the water absorption and transportation of roots.

Therefore, choose: d.