A Swiss police officer observes the surrounding area from atop the roof of the Davos Congress Hotel ahead of the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 21, 2019. REUTERS/Arnd Wiegmann

Naturalist Sir David Attenborough receives a Crystal Award from Hilde Schwab, Chairperson and Co-Founder of Schwab Foundation for Social Entrepreneurship, during an opening ceremony of the World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019.

A general view shows Davos in the evening ahead of World Economic Forum (WEF), Switzerland, January 20, 2019.

A night view shows a congress centre (C), the venue of the upcoming World Economic Forum (WEF) in the Swiss mountain resort of Davos, Switzerland, January 20, 2019.

Swiss special police officers leave a helicopter after landing in Davos, ahead of inauguration of World Economic Forum (WEF), Switzerland, January 21, 2019.

Saudi Arabian director Haifaa al-Mansour delivers a speech next to Hilde Schwab, Chairperson and Co-Founder of Schwab Foundation for Social Entrepreneurship, as she receives a Crystal Award during an opening ceremony of the World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019.

International Monetary Fund (IMF) Managing Director Christine Lagarde attends a news conference ahead of inauguration of World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019.

Naturalist Sir David Attenborough delivers a speech as he receives a Crystal Award, during an opening ceremony of the World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019.

U.S. conductor Marin Alsop receives a Crystal Award from Hilde Schwab, Chairperson and Co-Founder of Schwab Foundation for Social Entrepreneurship, during an opening ceremony of the World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019. Reuters/Arnd Wiegmann