In recent years there have been many alarming reports that world's climate is undergoing a significant change. All these reports provide (a)----- evidence (b) ------- world's temperatures are increasing day by day. This increase in global (c)----- is caused (d)----- increased amounts of carbon dioxide (e)------ the earth. Most climatologists (f). ------that greenhouse effect is the likely (g)----- of this global warming. It may harm human (h)-----seriously.