articulated barrel barrels chemical chemicals contaminate contamination corrode corrosion dioxin drum drums dump ecology environment environmental garbage gas gasoline green industrial industry issue issues leak leakage lorry management metal oil petrochemical petrol poison poisonous pollute polluting pollution recycle refine refined refinery rust rusty seep seepage seeping semi spill stare storage substance technology toxic trailer transport transportation vehicle waste weirdvis agricultural-pest arum-lilies arum-lily bush bushland calla-lily childsiana color colour death-lily declared-pest dense-clumps funeral-flower green-goddess herbaceous introduced invasive lifestock-threat lily-of-the-Nile out-of-control pasture-invader perennial pig-lily spreading St-Joseph's-lily surface surfaces surfacing texture textured textures thick-fleshy-leaf-blades varkblom weed white-arum-lily zantedeschia-aethiopica