Naturally, the distribution of precipitation across the planet is very uneven, causing constant variations in water availability in respective locations.
Changes in precipitation affect the timing and magnitude of floods and droughts, shift runoff processes, and alter groundwater recharge rates.
It is estimated that one in three people over the entire globe are already facing water shortages, almost one-fifth of the world population live in areas of physical water scarcity, and almost one quarter of the world's population live in a developing country that lacks the necessary infrastructure to use water from available rivers and aquifers.
Water scarcity is an increasing problem due to many foreseen issues in the future including population growth, increased urbanization, higher standards of living, and climate change.
Temperature rise can reduce the snow season in the winter and increase the intensity of the melting snow leading to peak runoff of this, affecting soil moisture, flood and drought risks, and storage capacities depending on the area.
Warmer winter temperatures cause a decrease in snowpack, which can result in diminished water resources during summer.Climate change affects the Earth's water supply in a large number of ways.It is predicted that the mean global temperature will rise in the coming years due to a number of forces affecting the climate.As indicated by the I=PAT equation, environmental impact (I) or degradation is caused by the combination of an already very large and increasing human population (P), continually increasing economic growth or per capita affluence (A), and the application of resource-depleting and polluting technology (T).Environmental degradation is one of the ten threats officially cautioned by the High-level Panel on Threats, Challenges and Change of the United Nations.A rise in air temperature results in a rise in water temperature, which is also very significant in water degradation as the water would become more susceptible to bacterial growth.An increase in water temperature can also affect ecosystems greatly because of a species' sensitivity to temperature, and also by inducing changes in a body of water's self-purification system from decreased amounts of dissolved oxygen in the water due to rises in temperature.Environmental degradation is the deterioration of the environment through depletion of resources such as air, water and soil; the destruction of ecosystems; habitat destruction; the extinction of wildlife; and pollution.It is defined as any change or disturbance to the environment perceived to be deleterious or undesirable.as climate change can affect the hydrologic cycle in a number of ways.Uneven distributions of increased temperatures and increased precipitation around the globe results in water surpluses and deficits, which can provide a positive feedback to the problems sea-level rise causes to fresh-water supply.