Question

how trees act as wind breakers in coastal areas?

Answer 1

$\large\color{purple}\mathcal{Hello\:Friend:)}$

Trees too acts as a vey good wind breakers.
The reason in quite simple.... Whenever the wind blows and faces some Trees planted in a row its velocity gets reduced. This happens because when the winds strikes the surface of trees they lose their much of kinetic energy and thus their velocity too gets decreased.