This video from Nature addresses red tide and the major threat it poses to the health of Florida’s springs and wildlife. In Florida, a disproportionate share of ground water is used to support agricultural businesses that raise crops, develop land, and cultivate golf courses, each depending on the use of nitrate-based fertilizers. Red tide occurs when the used water returns to the underground aquifers, triggering an outbreak of algae which in turn produces an abundant quantity of toxins.