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.
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.
This is especially important at mid-latitudes and in mountain regions that depend on glacial runoff to replenish their river systems and groundwater supplies, making these areas increasingly vulnerable to water shortages over time; an increase in temperature will initially result in a rapid rise in water melting from glaciers in the summer, followed by a retreat in glaciers and a decrease in the melt and consequently the water supply every year as the size of these glaciers get smaller and smaller.
Thermal expansion of water and increased melting of oceanic glaciers from an increase in temperature gives way to a rise in sea level.
The human population on Earth is expanding rapidly which goes hand in hand with the degradation of the environment at large measures.
Humanity's appetite for needs is disarranging the environment's natural equilibrium.
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.