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With the recent expansion of the Suez Canal, ecologists have voiced worries about the possible increase in the number of invasive species that travel between the Red Sea and the Mediterranean, which already impact tourism, fishing and even power production in the region. Dr Elizabeth Cook from the Scottish Association for Marine Science is one of the authors of a new report highlighting the problem and joins us on the programme. (Photo caption: A picture taken on July 29, 2015 shows a general view of the new Suez Canal in the Egyptian port city of Ismailia, east of Cairo © Khaled Desouki/AFP/Getty Images)