The world’s oceans are facing a series of escalating crises—from the death of coral reefs to overfishing that threatens marine ecosystems. But sitting at the TIME100 Talks in Rio de Janeiro on Nov. 4, legendary explorer and oceanographer Sylvia Earle wanted to take a minute to look backward at a threat to oceans from the previous century: whaling.  From the time the practice became a significant industry in the 18th century to its official ban in 1986, whale hunters were heralded with songs and