Jacinda Ardern, Prime Minister of New Zealand, speaks during the "Safeguarding the planet" session at the annual meeting of the World Economic Forum in Davos, Switzerland, Jan. 22, 2019. When Ardern steps down as prime minster next month, she will have accumulated 15 years experience as a lawmaker and five-and-a-half years as leader. (AP Photo/Markus Schreiber, File)
