Summer sun, warm temperatures, and pollution have all combined to brew up an explosion of potentially toxic cyanobacteria, also known as blue-green algae, in the Baltic Sea.
You can see the nasty muck up close in the photo above, taken on Sunday by a friend in Torö, Sweden, near Stockholm. On the same day that she posted the picture to Facebook, I spotted a view of the Baltic bloom on NOAA’s Environmental Visualization Laboratory web site:
In this image, Sweden is to the left. It w