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)
Further reading
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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.