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I remember reading the phrase “above the tree line” on various signs at Rocky Mountain National Park. The first few times it didn#8217;t make an impression. But after seeing it mentioned incessantly almost as if hammering the phrase inside the visitor#8217;s head, I paid attention. I then understood it to mean a certain elevation -- about 11,000 feet on Rocky Mountain (it varies in different earth regions) -- where the climate becomes too harsh for trees to grow. The highest elevation that sustains trees is called the “alpine” and the terrain is called the “alpine tundra”. (source: wikipedia.org). The line where trees stop growing -- and where the alpine tundra starts -- can be clearly seen here taken from above 11,000 feet.
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