They mean landfill as in a garbage dump: https://www.google.com/search?q=landfill&espv=2&rlz=1CAZZAD_enUS653US653&biw=1280&bih=715&source=lnms&tbm=isch&sa=X&ve

They mean landfill as in a garbage dump: https://www.google.com/search?q=landfill&espv=2&rlz=1CAZZAD_enUS653US653&biw=1280&bih=715&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj4t46YoLnLAhUJ5WMKHUUmC3oQ_AUIBygC https://www.google.com/search?q=landfill&espv=2&rlz=1CAZZAD_... There are many forms of carbon sequestration, but this is the first I've seen someone try to redefine it all as garbage. There is more than just plastic (carbon) in a landfill, some of which takes centuries to degrade.