Abstract
Global fresh water resources are finite and non replenishable. The renewable fraction of fresh water constitutes less than 1% of the total fresh water pool. This chapter discusses, at length, several aspects of sustainable water use for agricultural production, vis-a-vis global needs for all other purposes, including domestic and societal needs, in short, for the very survival of human kind on planet earth with the implications on food security. The chapter also discusses several other aspects of the key element, Nitrogen, in sustainable agriculture, starting from the nitrogen cycle to global warming, contributed by the unbridled use of urea in green revolution leading to enormous nitrous oxide emission, on urea hydrolysis, leading to global warming.
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