“Used cellphones, powered by solar panels, upload audio data. It is analyzed in real time by artificial-intelligence software capable of distinguishing the sounds of chain saws, logging trucks and other telltale audio signatures of illegal activity. The software then sends rangers instant alerts, through a specialized app that, in theory, could help them make arrests.” As the stakes rise, people are finding creative new ways to keep others from deforesting. NYT: Using Old Cellphones to Listen for Illegal Loggers.