Our relationship with plants has changed throughout history, and now it must change again. Whether it's what we eat and cultivate or whether it's what we like, we must now work with plants and make the world a little greener, a little wilder. If we do this, our future will be healthier and safer and, in my experience, at any rate, happier. Plants are, after all, our most ancient allies, and, together, we can make this an even greener planet.