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Water pollution affects , plants, and organisms living in these bodies of water; and, in almost all cases the effect is damaging not only to individual species and populations, but also to the natural biological communities. Around 1.2 billion people, or almost one-fifth of the world's population, live in areas of physical scarcity, and 500 million people are approaching this situation.
Another 1.6 billion people, or almost one quarter of the world's population, face economic water shortage (where countries lack the necessary infrastructure to take water from rivers and aquifers).
These lacustrine limestones commonly contain cherts that crosscut sedimentary structures.
World Water Day World Water Day has been observed on March 22 since 1993 when the United Nations General Assembly declared March 22 as World Day for Water.