S1 One major problem that the world faces today is the rapid growth of population.
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S5 This will cause serious problems of hunger and overcrowding!
P - This is often referred to as population explosion.
Q - It is not so much the actual population, but its increase that is alarming.
R - Experts predict that by 2020 there will be about 10 billion people in the world.
Choose from the options given below: