This tree doesn't look like it's doing very much: it just stands there in the sunlight, big and green. But this tree is busy. Starting with the secret workings of a tree, this book transports readers billions of years into the past; back to the moment when plant life first appeared on our planet. Covering its evolution, the steady emergence of fossil fuels and the extraordinary communities of plants around the world today, Nicola Davies and Emily Sutton combine essential biology with a powerful message, a call to protect the most precious colour on Earth... green.