Why are we now having erratic and unpredictable rains?

Hello,

Since last 15 years, I have observed a trend in the rains. The rains when they arrive they are massive, then a huge gap, again they arrive and are massive. It was not so in earlier days during my childhood, upto 1980-85 or so. Is it because the whole society is shifting towards more urbanisation? What is the reason ?

 

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