Step 4: Diagram the causal connections.
As Pollan says, the last thing you think about when you eat is the soil, right? Yet there’s a natural soil nutrient system that is easy to disrupt.
Here's a summary of what happens in the healthy soil system:
Soil that has ample air space and water movement helps grass and plants to grow. Healthy grass and plants produce sugar that is released through the roots of plants. The right amount of sugar production leads to healthy soil microbes that assist in the decaying process of plants and animals, which releases important minerals and nutrients, all of which contribute back to keeping the soil healthy.
Systems scientists and others often use diagrams called causal loop diagrams, to trace out the cause and effect relationships in systems. You can use these diagrams to both understand and predict system behaviors.
Now use Arrange It to turn the above paragraph into a causal loop diagram.