we’ve always wanted things from them. This isn’t mystical. The ‘environment’ is alive—a fluid, changing web of purposeful lives dependent on each other. Love and war can’t be teased apart. Flowers shape bees as much as bees shape flowers. Berries may compete to be eaten more than animals compete for the berries. A thorn acacia makes sugary protein treats to feed and enslave the ants who guard it. Fruit-bearing plants trick us into distributing their seeds, and ripening fruit led to color vision. In teaching us how to find their bait, trees taught us to see that the sky is blue. Our brains evolved to solve the forest. We’ve shaped and been shaped by forests for longer than we’ve been Homo sapiens.
“Men and trees are closer cousins than you think. We’re two things hatched from the same seed, heading off in opposite directions, using each other in a shared place. That place needs all its parts. And our part . . . we have a role to play in the Earth organism, and this . . .” She turns to see the image projected behind her. It’s the Arbre du Ténéré, the only thing up on a trunk for four hundred kilometers in every direction. Hit and killed by a drunk driver. She clicks on a Florida bald cypress one and a half millennia older than Christianity, killed a few months ago by a flicked cigarette. “This can’t be it.”
Another click. “Trees are doing science. Running a billion field tests. They make their conjectures, and the living world tells them what works. Life is speculation, and speculation is life. What a marvelous word! It means to guess. It also means to mirror.
“Trees stand at the heart of ecology, and they must come to stand at the heart of human politics. Tagore said, Trees are the earth’s endless effort to speak to the listening heaven. But people—oh, my word—people! People could be the heaven that the Earth is trying to speak to.
“If we could see green, we’d see a thing that keeps getting more interesting the closer we get. If we could see what green was doing, we’d never be lonely or bored. If we could understand green, we’d learn how to grow all the food we need in layers three deep, on a third of the ground we need right now, with plants that protected one another from pests and stress. If we knew what green wanted, we wouldn’t have to choose between the Earth’s interests and ours. They’d be the same!”
One more click takes her to the next slide, a giant fluted trunk covered in red bark that ripples like muscle. “To see green is to grasp the Earth’s intentions. So consider this one. This tree grows from Colombia to Costa Rica. As a sapling, it looks like a piece of braided hemp. But if it finds a hole in the canopy, the sapling shoots up into a giant stem with flaring buttresses.”
She turns to regard the image over her shoulder. It’s the bell of an enormous angel’s trumpet, plunged into the Earth. So many miracles, so much awful beauty. How can she leave so perfect a place?
“Did you know that every broadleaf tree on Earth has flowers? Many mature species flower at least once a year. But this tree, Tachigali versicolor, this one flowers only once. Now, suppose you could have sex only once in your entire life. . . .”
The room laughs now. She can’t hear, but she can smell their nerves. Her switchback trail through the woods is twisting again. They can’t tell where their guide is going.
“How can a creature survive, by putting everything into a one-night stand? Tachigali versicolor’s act is so quick and decisive that it boggles me. You see, within a year of its only flowering, it dies.”
She lifts her eyes. The room fills with wary smiles for the weirdness of this thing, nature. But her listeners can’t yet tie her rambling keynote to anything resembling home repair.
“It turns out that a tree can give away more than its food and medicines. The rain forest canopy is thick, and wind-borne seeds never land very far from their parent. Tachigali’s once-in-a-lifetime offspring germinate right away, in the shadow of giants who have the sun locked up. They’re doomed, unless an old tree falls. The dying mother opens a hole in the canopy, and its rotting trunk enriches the soil for new seedlings. Call it the ultimate parental sacrifice. The common name for Tachigali