Thorium is a naturally occurring radioactive chemical element. Almost all thorium is natural, but thorium isotopes can be artificially produced. Thorium occurs at very low levels in virtually all rock, soil, and water, and therefore is found in plants and animals as well. Energy from Thorium that is produced in a LFTR (Liquid Fluoride Thorium Reactor) is the closest thing to green energy on planet Earth. Many other energies such as wind and solar need a complimentary power supply that, unless it is a LFTR, is dirty or produces carbon dioxide. While carbon dioxide may or may not cause global warming there are medicinal benefits to having more oxygen in the air than carbon dioxide. Thorium is up to 200 times more energy dense than uranium and as common as lead. Therefore Thorium energy is a fraction of the price to produce than fossil fuels or solar and wind power.