Water availability
Only 2.5 percent of water on earth is fresh water. Less than 1 percent of fresh water is easily accessible to living things.
Source
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"OpenStax College, Biogeochemical Cycles. October 17, 2013."
http://cnx.org/content/m44889/latest/Figure_46_03_01.jpg
OpenStax CNX
CC BY 3.0.
