He has written popular books on the implications of science, notably The Tao of Physics, subtitled An Exploration of the Parallels Between Modern Physics and Eastern Mysticism. The Tao of Physics asserts that both physics and metaphysics lead inexorably to the same knowledge. After touring Germany in the early 1980s, Capra co-wrote Green Politics with ecofeminist author Charlene Spretnak in 1984.