Question

2. If the earth is covered with 75 per cent water, why do we always talk of scarcity of
water?​

Answer 1

Answer:

Water scarcity is the lack of fresh water resources to meet the standard water demand. Humanity is facing a water crisis, due to unequal distribution resulting in some very wet and some very dry geographic locations, plus a sharp rise in global freshwater demand in recent decades driven by industry. 

Explanation:

Because out of 75% only 3 % of water is drinkable rest is salty .

Answer 2

Answer:

because in world all water aren't used for the drinking purposes.

many waters are dirty and polluted.

if we drink polluted or dirty water also known as "kala pani in Hindi " the people or animal fall ill. Thus, many animals died / humans because of this. not in past today too and in future too if we don't save water.