cannock, staffordshire, uk. 11th august 2017. blue-green algae has hit problematic levels at chasewater country park with warning

abstract agriculture algae aquatic background bacteria biodiversity bloom blue chemical color contaminated cytotoxins detritus dirty ecology environment environmental flowing fresh green growth harmful industry lake landscape light nature organism pattern photosynthetic polluted pollution pond river scenery stagnant standing substance summer surface swamp texture toxic toxins unpleasant warm water weather