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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.
Sequoia and Kings Canyon National Parks boast many of the world's largest trees by volume. The General Sherman Tree is the largest in the world at 52,508 cubic feet (1,487 cubic meters). The General Grant Tree is the second largest at 46,608 cubic feet (1,320 cubic meters).