"It is feared that in the worst case scenario, at the end of 2020 there will be a decrease of about one billion international tourists, with a global economic loss of about 1,200 billion dollars," – Cardinal Turkson.

There are cases of seafarers and fishermen being effectively imprisoned on their ships, not paid wages and held in a modern-day form of press-ganging and slavery, says Cardinal Vincent Nichols, Archbishop of Westminster.