Invasion Of The Green Monsters
These are swirls of cyanobacteria on the surface of the pond I swam in today. The blue-green algae blooms are less dense away from the banks, but although they look beautiful they are potentially toxic. No-one really seems to know what makes these naturally-occuring single-celled organisms change from a healthy and almost invisible part of fresh-water ecology into something out of the Quatermass Experiment.
The Heath authorities have tried straw bales and oxidation but every year they bloom again. For some reason, more so in the Ladies’ pond then the Men’s.