In most people’s minds, greenhouses are usually made of glass – but modern commercial greenhouses use very strong polycarbonate plastic panels, which is much cheaper and can withstand very severe physical shocks. In fact, “bulletproof glass” is not glass at all but thick polycarbonate plastic. Scientists have tried putting entire ecosystems in greenhouses, but these initial experiments did not succeed in the long term. Someday, we may understand ecosystems well enough to successfully put a life system within giant greenhouses on Mars. Greenhouses will be the key to inhabiting other planets in the solar system. One day, the only type of farming we do may be greenhouse farming. Join the growing movement of successful farmers who have taken up greenhouse farming. Greenhousefarming.net provides the information, materials and community to succeed as a greenhouse farmer.