1. The sea has no natural system of water flowing in and out. 2. To avert this crisis, governments are melting glaciers and modifying natural systems . 3. Chaotic behavior exists in many natural systems , such as weather and climate. 4. The Land Institute promotes " natural systems agriculture " through plant breeding. 5. In both places, human encroachment has upset a delicate, little-understood natural system . 6. Heterodox economists instead emphasize the influence of history, natural systems , uncertainty, and power. 7. Pheromones may determine trophic web and play critical roles in maintaining natural systems . 8. Ultimately, every manufactured product in human environments comes from natural systems . 9. "We're pressing against the limits of lots of natural systems , " says Brown. 10. These processes impact the surface reactivity and mobility of nanoparticles in natural systems .
