While the ultimate fear on global warming is the melting of the polar ice caps and the rising sea level that will
flood coastal cities and states, a more immediate impact of global warming is already taking place. As the temperature
of the ocean and the air rises, the evaporation rate of sea water increases, and that ultimately affect the movement
the air and clouds in the lower atmosphere and changes weather patterns around the world. Some regions are experiencing
a lot more rain than usual in recent years that resulted in devastating floods. At the same time, other regions in the
world are receiving a lot less rain than usual, and that resulted in droughts and a serious water shortage crisis.
A combination of global warming and solar activities that impact weather patterns on earth, some regions are experiencing
extended droughts and a severe water shortage crisis.
Rapid human population growth
The world population back in 1950 was about 2.5 billion. In 2011, there are almost 7 billion people on Earth.
That is a population growth rate of almost 200% in just 60 years. At the same time, the amount of fresh water supply
stayed about the same. As the population grows, so has the demand for food. The problem is amplified by the fact
that about 70% of the fresh water being consumed by humans are used for irrigation in farming. Without a comparable increase
in the supply of fresh water needed for growing food, the cost of food can go up significantly.
Pollution of lakes, rivers, and other fresh water sources
Lakes, rivers, and underground water are the major sources of fresh water for human consumption. However, as comtaminants
from factories and pesticides from farms leak into nearby lakes, rivers, and underground water sources, the availablity of safe
and clean drinking water sources gradually disappear, amplifying the water shortage problem in regions where these factories and
farms are located.