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  • Where is the Planetary Boundary for freshwater being exceeded . . .
    For the globe as a whole, the operating space for humanity remains safe, as the aggregate value of human freshwater use (2508 km 3 year, of which 275 km 3 yr is livestock water use) is lower than the threshold of 4000 km 3 year proposed by (Rockström et al , 2009) However, we find that water withdrawals exceed sustainable levels in 8 65%
  • Anthropogenic alteration of nutrient supply increases the . . .
    change (7) and agricultural intensification has increased lake produc­ tion (autotrophy) and C burial rate (–108) Estimates of CO 2 and CH 4 emissions have been revised extensively (, 114) and recently, reassessments of historic (12) global lake and reservoir C burial rates have been made (13) Yet, the global drivers of freshwater
  • Water – at the center of the climate crisis | United Nations
    Climate change, population growth and increasing water scarcity will put pressure on food supply as most of the freshwater used, about 70 per cent on average, is used for agriculture (it takes
  • Crop insurance premium subsidy and irrigation water . . .
    We estimate the effects of the federal crop insurance premium subsidy on freshwater withdrawals for irrigation among U S counties to the west of the 100th meridian Our results indicate that a 1% increase in premium subsidy leads to a 0 446% (about 475,901 acre-feet year) and 0 673% (about 474,026 acre-feet year) increase in total freshwater withdrawals for irrigation and fresh surface water
  • Projected freshwater withdrawals in the United States under a . . .
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  • Chapter 7 Fresh Water
    7 1 Global Renewable Water Supply as River Discharge and Populations Dependent on Accessible Runoff at Point of Origin* 7 2 Cumulative Distribution of Population with Respect to Freshwater Services, 1995–2000 7 3 Contemporary Geography of Non-sustainable Withdrawals for Irrigation* 7 4 Managing for Environmental Flows: Contrasts among
  • Groundwater depletion and sustainability of irrigation in the . . .
    Irrigation consumed ∼90% of global freshwater resources during the past century (1, 2) and represents 20% of cropland and ∼40% of food production (2, 3) During the past couple of decades, groundwater has become an increasingly important source of irrigation and currently is used in ∼40% of the area equipped for irrigation globally and 60





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