the coast on the surface of the river is covered with a pellicle of blue-green algae, copy space

algae algal along background bad biodiversity bloom blooming bluegreen coast contaminated copy danger deficiency dirty ecology ecosystem environment environmental flora green harmful hazard industrial industry landscape marsh microorganism natural nobody outdoor oxygen pattern pellicle phosphates phytoplankton plankton plant polluted pollution problem problems river scarcity slime space summer surface texture the water