Aerial view of Saint-Michel-en-Grève beach. The green color of water is due to algae (Ulva armoricana) growth caused by nitrogen pollution from agriculture.
Aerial view of Saint-Michel-en-Grève beach. The green color of water is due to algae (Ulva armoricana) growth caused by nitrogen pollution from agriculture. Cotes d'Armor, Brittany, France, September 2006.