Fill in the blanks with an appropriate word in each gap:

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