Trees are for the wind to blow through.
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Answer:
Psithurism: the sound of wind whispering through the trees. Trees provide some of the most common and admired ways for wind to make itself heard. ... This sound has been termed psithurism (sith-err-iz-um).
There are many things that cause the wind to blow.
The basic mechanism is that something causes a pressure difference between two regions of the atmosphere, so the air in the high-pressure area flows into the low-pressure area.
One of the things that can cause a high-pressure area is trees. Trees pull water from the ground and evaporate it from its leaves, a process called transpiration. This has the effect of cooling the air, which makes it denser, which causes higher pressure.
This is a minor effect, though, compared to the power that the Sun can generate over large areas of the planet!