50 years ago the water bodies were fresh and clean and were useful for drinking,bathing, etc
due to the clean water the climate used to be always pleasant and cool 
water bodies were very deep and used to have full of water 
but now a days due to the pollution in nature the water is being polluted and animals in the water are losing their lives due to pollution
but previously animals used to live in water very happily and now they are afraid of living in water