Meinrat Andreae walked into a clearing where a fallen par-ica tree had torn a hole in the canopy of the rainforest. He recorded the location on his Global Positioning System device and then paused to marvel at a blue Morpho butterfly that fluttered past. In place of the fallen giant, Andreae and a team of scientists from Germany and Brazil will soon plant more than 100 tonnes of steel that will dwarf even the largest trees, offering scientists an unprecedented perch above the rolling hills of the central Brazilian Amazon.
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