Cutting too short results in a small, shallow root system that loses moisture too quickly, makes more light available for weed seedling growth, and increases disease and insect possibilities. Leave clippings on the lawn. Short clippings decay rapidly, hold in moisture, and don't contribute to thatch. Please remember, more is not better. Regularly check your lawn for pests and diseases.
High levels are usually the result of, rather than the cause of, a poor lawn.
Identify and consider possible action - like a spot treatment rather than an full scale application. Before you toss that package, take a second to see if it can be used for something else. About a third of our garbage in landfills is packaging. Take a look at the shelves next time you shop. Support manufacturers who have reduced their packaging.