Important:
If you want to understand why the actual count of trees is not enought, please carefully read following:
If , then probably first was bacteria in the ocean , then grass in the water and organisms , then grass and swamps on mainland with some life , then little bit taller grass with a little bit more of life , then quite alive bush and in the end of it "tall old living forest" with many levels. And gues from where humans came? We grew up in the forest. The home of trees. It was, it is and it is going to be always only one true natural shelter providing naturaly tested and naturaly evolved sources to keep us alive.
Now, try to imagine if all fields and buildings in the world disapeared. . . What left?
Did you get it? Yes? So I have a question for you: Where are you going to find unpoisoned water and food?
Yes, most of readers who imagined are probably correct. Into forest. But wake up! Nowadays there is almost no forest on The Earth to provide you shelter , enough water , food , clouds , rain , air filtration , etc . . . !!!
Humans still act as if the original purpose of forest is usless and not to provide us breathable air, drinkable water and vast types of plants to eat and heal.