Lynn Osburn wrote an excellent paper on biomass fuels entitled, Energy Farming in America. The hemp plant has no psychoactive properties. Cultivating hemp can help replenish spent soil. Hemp can grow almost anywhere, and requires far less pesticides than many other cash crops, such as cotton. Hemp can be used for fuel, fiber, food, medicine, and industry.
Hemp seed is highly nutritious.
Hemp fiber is durable and strong. Extractums made from hemp were a valued medicine for thousands of years, but prohibition in the 1930s ended all of that. Hearst deliberately confused psychoactive marijuana with industrial hemp, one of humankind's oldest and most useful resources. DuPont and Hearst were heavily invested in timber and petroleum resources, and saw hemp as a threat to their empires. Petroleum companies also knew that petroleum emits noxious, toxic byproducts when incompletely burned, as in an auto engine.