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We dig, then fill it with bioenergy, which heats the foil tent - this is how we could summarize the essence very simply. Of course, this method is much more complex, but it is not at all impossible to do at home. A compost-heated greenhouse can be created in any small garden. Web: http://gazdasagtv.hu Facebook: / gazdasagtv Twitter: / gazdasagtv Subscribe, don't miss the best economic videos: http://www.youtube.com/subscription_c...