Getty Images / WIRED If a tree is illegally cut down in a remote section of the rainforest, does anyone hear the sound? If that section of the rainforest is using Rainforest Connection’s treetop surveillance technology, then yes, someone actually does hear the sound. They also act on it. The forest-monitoring technology, dubbed “Forest Guardians”, started off in 2012 as an idea to use recycled, solar-powered cellphones fitted with artificial intelligence software to monitor the activity and biodiversity of the surroundings. Re-fangled cell phones were mounted several hundred feet in the...