TECHNOLOGY FOCUS - INDUSTRIAL STANDARDS - Preferred Method: In producing biochar from green waste for use in the preparation of the soil horizon, one or more moisture reduction processes reduce the moisture content of the green waste, in which the moisture reduction processes include dehumidification. The moisture reduction processes include passing heated gas past or at least partially through the green waste; and mechanical extraction means. A proportion of the heated exhaust gases drive a gas turbine, and where a proportion of the heated exhaust gases are ducted away for use in a central heating system. The method further comprises channeling the recovered moisture to one or more recycling centers, where one of the recycling centers is an irrigation system, or a housing building development. In restoring contaminated land, the thickness of the layer creating the pozzolanic pan is or is approximately 1.5 m. A set of soil horizons, each having a separate composition, are laid over the pozzolanic pan. A first soil horizon is laid over the pozzolanic pan, the first soil horizon having a composition including pulverized fly ash mixed with biochar. The composition of the first soil horizon also includes stone and/or crushed brick, where the thickness of the first soil horizon is or is approximately 1.5 m. A second soil horizon is laid over the first soil horizon, the second soil horizon having a composition including pulverized fuel ash and biochar. The composition of the second soil horizon also includes stone and/or sand and/or silt. The composition of the second soil horizon also includes waste organic matter, where the composition of the second soil horizon includes less than 1% waste organic matter by volume, where the organic matter is sewage sludge. The composition of the second soil horizon includes 60% or approximately 60% pulverized fuel ash and 40% or approximately 40% biochar by volume. The thickness of the second soil horizon is or is approximately 1.5 m. Moreover, a third soil horizon is laid over the second soil horizon, the third soil horizon having a composition including pulverized fuel ash and biochar, where the composition of the third soil horizon also includes stone and/or sand and/or silt. The composition of the third soil horizon also includes waste organic matter. The composition of the third soil horizon includes less than 3% waste organic matter by volume. A fourth soil horizon is laid over the third soil horizon, the fourth soil horizon having a composition including pulverized fuel ash and biochar. The composition of the fourth soil horizon also includes gravel and/or sand and/or silt. The composition of the fourth soil horizon also includes waste organic matter. EXAMPLE - No suitable example given.