You don't know that trees have very important uses when it comes to keeping humans alive. They sure do and it's only a matter of time if they get destroyed that humanity could come to an end.
It's the very reason why you breathe, without them there would be no source of oxygen for you to take in. And as much as we use what they deposit, they also use ours cause they use carbon dioxide to stay alive also.
And that's the main reason why you should have at least gardens at homes especially in cities to keep yourself healthy when it comes to breathing in. And also doing so you're preserving nature and keeping it alive.
So make sure to stop deforestation and if it calls for that you should plant 2X the tress you cut off to keep the forest alive and nature preserved.
Plants(trees) takes in carbondioxide and breathe out oxygen then human and all other animals breathes in oxygen and breathes out carbondioxide.