Beaches in goa littered with empty beer and alcohol bottles

One of the reasons why the number of tourists in goa, is declining according to the goan newspapers is that beaches are flooded with empty beer and alcohol bottles. Increasingly tourists are visiting goa mainly for drinking cheap alcohol, and instead of spending money on accomodation, they are using the beaches as they bedroom and bathroom also
They will spend all their time on the beach, and most of the time is spent drinking alcohol.
After they finish drinking they will leave for the state they have come from, and the beaches are filled with empty bottles
The problem is severe during the peak season during christmas.