phytocapping
n.— «Landfill sites produce the greenhouse gases, methane and carbon dioxide, as putrescible waste decays. Growing plants and trees on top of a landfill, a process known as “Phytocapping,” could reduce the production and release of these gases.» —“Putting a green cap on garbage dumps” in Australia EurekaAlert Nov. 24, 2008. (source: Double-Tongued Dictionary)
Phytocapping does much more than simply reducing the release of methane and other greenhouse gases. Perhaps an even more compelling benefit is the ability of the phytocap to act as a “sponge” that soaks up rainwater and prevents it from leaching through the landfill and polluting the groundwater beneath. For more detailed information about the benefits and methodology of phytocapping, Phytocapping.com has a few great articles about it.