Water shortages may be caused by climate change, such as altered weather patterns including droughts or floods, increased pollution, and increased human demand and overuse of water. A water crisis is a situation where the available potable, unpolluted water within a region is less than that region’s demand.
At the current rate of consumption, this situation will only get worse. According to the WWF,
by 2025, two-thirds of the world’s population may face water shortages. And ecosystems around the world will suffer even more.
Freshwater accounts for only 2.5 percent of the earth’s water, and only 1 percent of our freshwater is easily accessible. That means only 0.007 percent of the planet’s water is available to the entire world’s population.
This is a staggeringly small figure. Because of climate, geography, politics, competition and economics, some regions already are in drought situations on top of poor sanitation. It is sometimes impossible to obtain clean water those living in the developing world.