Bitumen permeates the dirt at the surface or, where thin layers of compost and sediment intervene, somewhat below basement levels.

Elsewhere, prisons in Rwanda are using their 30,000 inmates sewage to provide biogas for cooking and compost for growing vegetables.

The organic waste is processed in a fermentation plant, producing compost and methane, which is used to produce electricity in a 25 megawatt power plant.

Today it is realized to get around this problem local cities and farms can work together to produce the needed compost for the farmers around them.

Today the growth of local farmers' markets offer small farms the ability to sell the products that they have grown back to the cities that they got the recycled compost from.

The Infinity Burial Project began a few years ago with a fantasy to create the Infinity Mushroom a new hybrid mushroom that would decompose bodies, clean the toxins and deliver nutrients to plant roots, leaving clean compost.

Sewage is produced by all human communities and is often left to compost naturally or is treated using processes that separate solid materials by settlement and then convert soluble contaminants into biological sludge and into gases such as carbon dioxide or methane.

And then the compost is all taken back to the roofs of the city, where we've got farming, because what we've done is lifted up the city, the landscape, into the air to to restore the native landscape on the roofs of the buildings.

That you can go from this zero situation, by planting the vegetables and the trees, or directly, the trees in the lines in that grass there, putting up the buffer zone, producing your compost, and then making sure that at every stage of that up growing forest there are crops that can be used.