Assignment task: World water crisis. Summarize why there is an impending water crisis in the world, including what percentage of the world's water is fresh water, who is most vulnerable, and what human activities uses up most of the world's water. What happens to the water supply when people join the middle class? Summarize the world's response to the issue so date, including the UN's role. Next, explain how the crisis might affect you or someone you know. List two policies you think the US should undertake to combat this threat.