Although many studies have documented how artificial light harms individual species, the impacts on whole ecosystems and the services they provide, such as crop pollination, is less clear. Researchers are growing increasingly concerned about the problem. This experiment near Berlin is the most ambitious of several projects going on in dark patches of countryside around Europe, set up in the past few years to probe what light pollution is doing to ecosystems. They are testing what happens when they rob the lake creatures of their night. Nearby, bobbing red torchlights - the least-disruptive part of the visible spectrum - betray the presence of scientists on the shoreline. Beyond the dark waters lapping at the shores, a faint glow emanates from rings of light hovering above the surface. It’s a summer night near a forest lake in Germany and something unnatural is going on.
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