Which of the following is a possible solution to water scarcity?

Promoting xeriscaping is a highly effective solution to water scarcity because it involves designing landscapes that require minimal irrigation. This approach is particularly beneficial in arid and semi-arid regions, where water availability is limited. Xeriscaping emphasizes the use of drought-resistant plants, efficient irrigation techniques, and landscape designs that reduce water runoff and evaporation. By using native and adapted plant species that can thrive in low-water conditions, xeriscaping significantly reduces the overall demand for water in landscaping.

In contrast, the other options may not effectively address water scarcity. While the construction of dams might temporarily store more water, it can also lead to ecological disruption and is often not a sustainable long-term solution. Decreasing irrigation frequency can lead to stressed plants and diminished crop yields if not managed correctly. Planting more lawns can actually exacerbate water scarcity issues, as traditional lawns typically require significant amounts of water to maintain, particularly in climates where water is already limited. Therefore, promoting xeriscaping stands out as a sustainable and proactive measure to mitigate water scarcity issues.