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