Editing Twelve leverage points (section)

=== 12. Constants, parameters, numbers ===
Parameters are points of lowest leverage effects. Though they are the most clearly perceived among all leverages, they rarely change behaviors and therefore have little long-term effect. {{quote|For example, climate parameters may not be changed easily (the amount of rain, the [[evapotranspiration]] rate, the temperature of the water), but they are the ones people think of first (they remember that in their youth, it was certainly raining more). These parameters are indeed very important. But even if changed (improvement of upper river stream to canalize incoming water), they will not change behavior much (the debit will probably not dramatically decrease).}}