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One of the possible solutions to reduce or eliminate landfill gas emissions is to cover the landfill with bioactive cover layer, where methane is oxidized in-situ. The main innovation of the closure project at Kudjape landfill, Estonia, was to extract the < 40 mm fine fraction from the same landfill cell by using landfill mining technology in order to construct a methane degradation cover and to restore the previous landfill area for the benefit of the community. European larch (Larix decidua) and Norway spruce (P...