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Use "treeline" in a sentence
"The responses to warming were much greater in Swedish treeline heath and in fellfield [36]."
"Having watched the Great Escape again I considered constructing a tunnel as far as the treeline from the pulpit area of the custody facility where I am currently detained for the duration (admittedly at the right side of the cell doors) but then thought better of it as I didnt think that I would get far with a spork as my only digging implement."
"The treeline was an unbroken line of oaks and maples, with no sign of human life."