There is not enough water globally for all the things humans
need and want water to do for us. Water supply bubbles are bursting
in China, the Middle East and India with potentially serious
implications for the global economy and for political stability.
Even the United States is depleting groundwater on average 25%
faster than it is being replenished. Our thirst for water grows
with our population, but the amount of fresh water available on
Earth is fixed. If we assume "business as usual" by 2050 about 40%
of the projected global population of 9.4 billion is expected to be
facing water stress or scarcity. With increasing climate
variability being predicted by global climate models, we are likely
also to have more people without adequate water more of the time,
even in water-rich regions.
Irrigation productivity rose dramatically over the past 40 years
as a result of the Green Revolution. However, even if we disregard
the environmental impacts caused by that revolution, we are no
nearer to achieving global food security than we were 40 years ago,
as every time we come close to filling the food production gap
population growth and ecosystem decline associated with water
diversions to human purposes set us back. Our natural and
agricultural ecosystems are trying to tell us something.
This book pursues these overarching themes connecting to water
and food production at global and regional scales. The collection
offers a comprehensive discussion of all relevant issues, and
offers a wide-ranging discussion with the aim of contributing to
the global debate about water and food crises.
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