In the past, the major need of people in this world was arable land. Man
did not have to think about animate things. However, now the adverse
effects on forests through over-population and the development of
various chemical elements in the atmosphere have led to irregular
rainfall and global warming. This global warming has brought changes in
climate, including making perennial snow mountains melt, thereby
adversely affecting not only human beings but also other living species.
This dangerous situation is being taken very seriously by the world.
In the past the perennial snow mountains of Tibet had very thick snow.
Older people say that these mountains were covered with thick snow when
they were young and that the snows are getting sparser which may be an
indication of the end of the world. It is a fact that climate change is a
slow process taking thousands of years to realize its effect. Living
beings and plant life on this planet also undergo change accordingly.
Man's physical structure too changes from generation to generation along
with the change in climatic conditions.