One idea that you can easily develop is that water is life. For, nothing that lives can survive without water. Thus, it is our most precious commodity.
Surely, there is much support that you can locate. For instance, some years ago, it appeared that Lake Erie had so much pollution that reversing the situation seemed impossible. However, scientists were able to restore the lake, restock it with fish, and make it possible for people to drink its water.
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In another instance of not understanding our precious water is Atlanta, Georgia's city leaders did not plan well enough to have sufficient water for its growing population, and after two years of drought, Atlanta began a "water war" with its neighboring state of Alabama in order to obtain water rights. Now, after two years of fighting, Atlanta has yet to build any reservoirs to hold all the rain that has fallen in these past two years of very wet weather.