One of the easiest ways to keep your lawn healthy and green is to compost it 2-3 times a year. This is preferable for many people because it's safe and organic, and you're not constantly adding chemical-based fertilizers to your yard or garden.
Compost makes a great fertilizer, because in addition to having important nutrients like nitrogen, phosphorus, and potassium, it often has trace elements you don't ordinarily find in commercial fertilizers.
Less than three percent of the earth’s water is fresh, and out of that about one percent is accessible. The increase in world population, pollution, droughts resulting from global climate change, and other meteorological factors have put an enormous strain on this resource. This has led to developments such as restrictions on water use in many communities in North America and mass migrations in other parts of the world.