Though it gets more than four feet of rain a year, groundwater aquifers in Florida are growing perilously low, much like in many other states. And that's triggering lots of secondary environmental problems, from toxic algae blooms to sinkholes that can swallow entire homes. This week on Parts Per Billion, we speak with Bloomberg BNA's Amena Saiyid about what's driving this problem and about what she saw on a kayak trip to a shallow Florida river.

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