Climate change is defined as change in climate over time, whether due to natural variability or as a result of human activity. United Nations Frame work Convention on Climate Change defines Climate Change “a change in climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable periods of time”.

Climate change poses a serious threat to the productivity of natural resources especially water resources. The adverse effects of climate change defined in UNFCCC clearly disclosed that changes in the physical environment adversely affects the natural ecosystems, socio economic systems and human health

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