Billions needed to save Cape Cod waterways

It could cost billions of dollars to save Cape Cod's waterways from algal blooms that are gobbling up all available oxygen and leaving stagnant dead zones in their wake, officials say. The algae thrive on nitrogen-rich waste water from septic systems, so saving the waterways will involve vast new sewerage and wastewater systems across the region, along with major new projects to widen inlets and increase tidal flow.

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