How Much Has Hunting Affected Whales?
In order to know that, we need to know how many whales were in the oceans 200 years ago, BEFORE the industrial whaling era. One way to do this is to measure whale songs, but how can we listen to sounds that no longer exist?
Two researchers have managed to do that by using whaling records to estimate how loud whale sounds were 50 years ago, compared to today, by analyzing whaling records, assigning sound levels to the number of whales killed, and comparing those sound records to the CURRENT ocean racket. They have come to the conclusion that the ocean is much louder today, now that most whaling has become illegal.
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