GE CLST M1A Lecture Notes - Lecture 15: Food Security, Evapotranspiration, Transpiration
25 May 2017
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Document Summary
Intro to hydrologic cycle; hidden water; issues re: bottled water (quality and environmental. Freshwater: freshwater = water that is relatively pure, with few dissolved salts only 2. 5% of total water, 79% of freshwater tied up in glaciers and polar ice caps, much groundwater is inaccessible. In cool air, water vapor condenses and forms clouds: precipitation, water releases from clouds as rain, sleet, snow, hail, in ltration, a portion of precipitation seeps into ground. Hits water table, where the spaces between rocks and particles are saturated: groundwater moves slowly toward the ocean, runoff, precipitation that doesn"t in ltrate runs off into creeks and rivers. Planetary boundary for water use: water use is one of the planetary boundaries, humanity is the dominant force altering river ows globally. Global manipulations of freshwater cycle affect: biodiversity, food security, health security, the resilience of terrestrial and aquatic ecosystems, ecosystem functioning, habitat, carbon sequestration, climate regulation.
