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Tasmania's giant ash trees may be world's tallest. Stephen Sillett's laboratory is dangling 90 metres above the ground. It is an intricate web of ropes and instruments strung up in the branches of a tree. And in the windy conditions that plague Tasmania's forests, it can be distinctly precarious.
Photograph by Infinita Highway, Getty Images. Some call this Montezuma cypress the largest tree in the world, thanks to its bulky base. According to its UNESCO World Heritage site nomination, the so-called Ãrbol del Tule, or Tule Tree, measures 115 feet around and 98 feet high.