Invasive aquatics choke Rio Grande

Two non-native aquatic weeds are creating an international incident, of sorts, along the Mexican-U.S. border. Hydrilla and water hyacinth are clogging the Rio Grande to the point where many Mexican communities that use the river have no water whatsoever. Brownsville, Texas, which also utilizes the Rio Grande, has had no supply interruptions due to pumping and reservoirs that are used to store water.