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Trees communicate through chemical signals from "summary" of The Overstory by Richard Powers

Trees send messages using scent, just as animals do. The perfume of freshly-mowed grass is a distress call, pleading for mercy. A cabbage's bitter funk is an alarm. A pine's turpentine whispers away herbivores. Trees have a language of volatile chemicals that they use to talk to each other. They warn each other of pests, and they call in other creatures to subdue them. The average tree is in touch with its roots, and the roots are in touch with the fungi, and the fungi are in touch with the other trees. They share their surplus carbon with the sick and the old, and they pass along warnings of dangers. They warn their neighbors when they are under attack, and they band together to fight off threats. Trees have been at it for hundreds of millions of years, speaking in a language older than animals. They have learned not just to live, but to survive. They have learned to be each other's keepers. They have learned to be good ancestors. They have learned to pass on the knowledge of how to make a living in a world that's always trying to push them out. They have learned to be in it together. They have learned to be a forest. Forests are not just collections of trees, but communities of trees that work together to keep each other safe and healthy. They share resources, communicate through chemical signals, and even help each other grow. The interconnectedness of trees in a forest is a marvel of nature, a testament to the power of cooperation and communication. By understanding how trees communicate through chemical signals, we can gain a deeper appreciation for the complexity and beauty of the natural world.
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    The Overstory

    Richard Powers

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