A tree - what is it?

A tree - what is it?
A thing, which is standing in the way
when new factories are planned?
A thing, which is old and useless?
A thing, which is big and thick?
A thing, which is green in summer?

NO! A tree is more!

A tree is a living thing,
which is necessary for all the people, animals and plants,
A tree can spend shade when the sun is shining,
A tree can spend dryness when rain is falling -
A tree is the most important thing in general!