Final answer:
Water-stressed countries need to address water scarcity and water quality when looking at future water use.
Step-by-step explanation:
When water stressed countries look at future water use, two factors that need to be addressed are water scarcity and water quality. Water scarcity refers to the limited availability of water resources, which can result in a lack of enough water to meet the needs of the population. Water quality, on the other hand, focuses on the contamination and pollution of water sources, which can make the available water unsafe for human consumption and agricultural use.