(a) Harmful effects of global warming:
(i) Warmer waters and more hurricanes: As the temperature of oceans rises, so will the probability of more frequent and stronger hurricanes.
(ii) Increased probability and intensity of droughts and heat waves: Although some areas of Earth will become wetter due to global warming, other areas will suffer serious droughts and heat waves.
(iii) Polar ice caps melting: The ice caps melting are a four-pronged danger. It will raise sea levels.
(iv) More floods: Flooding represents one of the most dangerous hazards to human settlements and as the climate changes, a warming of the seas creates ‘thermal expansion’. This is where warm water begins to take up more space than cool water, making the sea’s surface level increase.
(b) Water Cycle :