The world is lit at night like never before, and ecologists are assessing the damage. It’s a summer night near a forest lake in Germany and something unnatural is going on. Beyond the dark waters lapping at the shores, a faint glow emanates from rings of light hovering above the surface. Nearby, bobbing red torchlights β€” the least-disruptive part of the visible spectrum β€” betray the presence of scientists on the shoreline. They are testing what happens when they rob…