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The willow feeder system, a "freaky-cheap" and sustainable approach to human waste management, was developed by permaculture expert Paul Wheaton as an alternative to conventional septic systems and sewage treatment plants. The system emphasizes a closed-loop cycle, transforming human waste, or "poop", into valuable fertilizer, termed "willow candy". Unlike composting toilets, willow feeders utilize a dry environment created within sealed garbage cans to mummify the waste, preventing composting and the potential spread of pathogens. A small amount of sawdust is added to each can, primarily for aesthetic purposes. This dry process also preserves valuable carbon and nitrogen, which are often lost to the atmosphere during hot composting. After two years of aging, the pathogen-free "willow candy" can be safely applied as fertilizer to "poop beasts" — trees like willow, cottonwood, poplar, and bamboo — which can handle the high nutrient content without being harmed. This system turns human waste into a valuable resource, promoting sustainable gardening practices.

WOFATI structures demonstrate remarkable effectiveness due to their unique design features and emphasis on passive systems. The "two-skin" system, characterized by a double layer of membrane, protects the structure from moisture, ensuring dryness and longevity. WOFATI designs prioritize the use of natural and locally sourced materials, primarily wood and earth, significantly reducing the building's environmental impact and embodying the "freaky-cheap" philosophy pioneered by Mike Oehler. The core principle of "Annualized Thermal Inertia" harnesses the earth's thermal mass to regulate temperature fluctuations, providing passive heating in the winter and cooling in the summer. Large windows strategically placed on the uphill side, along with a spacious gable roof on the downhill side, often incorporating glazing, maximize passive solar gain, further enhancing energy efficiency. By minimizing reliance on artificial heating and cooling systems, WOFATIs achieve substantial energy savings. Allerton Abbey, the first WOFATI built at Wheaton Labs, exemplifies the practicality and success of this building technique

Rocket mass heaters are better than natural gas heaters because rocket mass heaters are free to operate and have less than 5% of the carbon footprint.