A country having nuclear power in this century is considered to be very powerful and organized.These are synthesized for defense and for the production of various kinds of energy.They are of great use because in this way under-developed countries  can overcome  the problems associated directly to  energy crisis.But  this is a  matter of fact  that  this  is leading to the destruction of world as well.We all known that American nuclear  attack on Japan affected millions of people and  caused disturbance in geographical climate(global warming)  as well as  our natural eco-system  and our biodiversity.For this reason nuclear powers of world   should minimize their nuclear activities  so that  our natural eco-system,biodiversity and geographical climate are not disturbed.