A treebog is a type of low-tech compost toilet. It consists of a raised platform above a compost pile surrounded by densely planted willow trees or other nutrient-hungry vegetation. It can be considered an example of permaculture design, as it functions as a system for converting urine and feces to biomass, without the need to handle excreta. Defecating in nature is frowned upon in most countries, as it pollutes the environment and causes health problems. High levels of open defecation are linked to high child mortality, poor nutrition, poverty, and large disparities between the rich and the poor. Human faeces normally take about a year to biodegrade outdoors. In the UK, a system like this is potentially legal, so long as it not in a public place, i.e. on a large private estate. Etymology The term "Treebog" was coined by Jay Abrahams. Bog is a British English slang word for toilet, not to be confused with its other meaning of wetland. History The treebog is a simple method of composting wastes. Abrahams claims that from 1995-2011, around 1500 treebogs may have been built in Britain. In 2011, Abrahams claimed that the treebog had attracted the attention of NGOs and aid workers who hope to develop its potential for shanty towns or refugee camps - anywhere that water is scarce and the population pressure on resources is high. Plant growth A treebog is simply a controlled compost heap whose function has been enhanced by use of moisture or nutrient-hungry trees. They use no water, purify waste as they create a biomass resource, and also contain the organic waste material, thus preventing the spread of disease. The main requirement is that the planted species should be nutrient-hungry. It is a bonus if they can be harvested or pollarded for productive uses, e.g. willow cultivars. Apart from willows, mint will thrive around a treebog. If left unmanaged, a treebog will soon be surrounded by weed species, such as nettles. Both the solids and liquids are deposited within the treebog base, where the solids compost and the liquids soak through the soil. The roots and associated mycorrhizal species allow the nitrogen to be absorbed. The faeces should be well ventilated to allow aerobic decomposition. Construction A seating platform/cubicle is mounted at least one meter high. The area beneath the seating platform is enclosed by two layers of chicken wire or plastic mesh, which act