Trees talk to each other

Have you ever thought of how trees communicate.You might be curious to know,the same curiousity made me to search about this topic and I found it.
         I have seen a TEDx talk which explains how trees actually communicate.I came to know that trees actually communicate through roots in form of carbon molecules sharing.This has been proved in the canadian forest by that person who gave the talk.She planted 80 replicas of three types of plants together with plastic covers over them and then she injected different types of carbon isotopes into that plastic bags and left them for an hour so that the plants can absorb the carbon gas and start photosynthesis.After an hour she tested the plants then she came to know that two plants shared carbon dioxide through roots because there is not other way for the carbon gas to enter except through roots because she covered plant with plastic cover.She came to know that same type of communication happens in forests also,it's like a internet beneath the surface of forest,where giants helps small plants to grow by suppling carbon dioxide.She also proven that the tree of one species recognise the same type of child tree and supplies more carbon dioxide like mothers caring their childrens.One of the best part is if an old tree is about to die it sends the carbon molecules into the network so other trees can utilize it,because trees are not selfish like humans.They even provide enough space for the same type of child plant to nourish their roots.
    So there is network in forest which is a biological network which helps for plants to upload and download data in form of carbon molecules.