It looks like someone spilled green paint across Baltimore’s Inner Harbor — but this eerie glow isn’t pollution.
It’s a pistachio tide, caused by sulfur-loving bacteria rising from the harbor’s depths as warm days and cold nights flip the water column. When sunlight hits the surface, ultraviolet light reacts with the sulfur, creating that surreal green hue — and a terrible smell to match.
But behind the beauty lies a warning: this inversion also brings oxygen-depleted water to the surface, triggering massive fish kills and revealing the fragile state of a man-made harbor trapped in stagnation.
waterloop is a nonprofit news outlet exploring solutions for water sustainability. Visit https://www.waterloop.org/
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