environmental implications of the above mentioned practices.

Good recycling of gardening/kitchen waste back into the garden; Saves importing material into the garden that may be contaminated, or involving the cost of transport; Saves on the use of fertilisers with its implication of energy consumption in their manufacture; But Run off/leaked liquid needs to be controlled (can contaminate waterways); Estate sized gardens might need a licence for composting below 1000m³; Hygiene, possible transfer of pathogens? Variable mineral content.