A man (R) that rescued a migrant, is seen on an inflatable boat, gives the thumbs up to officers on a Greek Coast Guard vessel, near the shores of the Greek island of Lesbos, November 10, 2015. Since the start of the year, over 590,000 people have crossed into Greece, the frontline of a massive westward population shift from war-ravaged Syria and beyond. REUTERS/Alkis Konstantinidis