The consequences of transfers of microplastics from urban waste water to agricultural soil have barely been considered by researchers and authorities, particularly in lieu of the extended attention directed at microplastics in the ocean. (sciencenordic.com)
But it seems pretty clear that small - scale urban farm biogas digestion has great potential for gleaning energy from urban waste streams, recapturing valuable nutrients and returning them to the soil, and of course keeping rotting matter out of landfills7mdash; preventing both methane emissions and leaching in the process. (treehugger.com)
Others include timber processing wastes, urban waste wood, landfill methane, and modest amounts of agriculture residues. (wri.org)