The complete story of the Hemp plant (marijuana, Cannabis Sativa). Hemp, probably the first plant ever to be cultivated, was among the world's largest agricultural crops until the late 1800s. Anthony Clarke's documentary explores the plant's fascinating history, its myriad uses, its intense controversy and its modern potential to solve major environmental and social problems. Some have gone so far as to claim that hemp, together with the bio-technologies presented in the film, could revolutionize the planet with a shift from the present unsustainable, petro-chemical based economy toward a sustainable plant-based economy.