In the southernmost reaches of Australia, the pristine island of Tasmania has virtually eliminated the coronavirus by cutting itself off from the mainland.The remote state’s four-month run without local transmission puts it among the world’s most successful places in curbing the Covid-19 disease.From Australia to India, are lockdowns working?But the economic cost for the island, where almost 1 in 5 jobs is reliant on tourism, is mounting.“It’s been devastating,” said Robert Pennicott from his…