THE TREE AT THE BOTTOM OF THE WORLD.

Tucked against a slope and protected from the wind, the trees have grown unusually tall for Isla Hornos, where most trees aren't much bigger than Díaz himself. And a small team will help Buma spot his tree. PHOTO (COLOR): Forest ecologists Brian Buma (at left) and Andrés Holz scan the grassy ledges of Cape Horn's headwall on Isla Hornos, the last point in South America where a tree might grow. Buma, Harley, and Andrés Holz, a Chilean-born forest ecologist from Portland State University, tramp over spongy bogs and mounded cushion plants, looking for trees. [Extracted from the article]