The World Economic Forum Annual Meeting convenes in Davos, Switzerland; the U.S. Senate begins the impeachment trial of President Donald Trump; a series of activities marking the 75th anniversary of the liberation of the Auschwitz concentration camp begins.

This year marks the 50th anniversary of the WEF and the theme for 2020 is Stakeholders for a Cohesive and Sustainable World.

Business leaders and politicians from around the world are gearing up to attend the event, including Chinese Vice Premier Han Zheng, U.S. President Donald Trump, Finnish Prime Minister Sanna Marin, European Commission President Ursula von der Leyen, head of the European Central Bank Christine Lagarde, 17-year-old Swedish climate activist Greta Thunberg.

Economic and political polarization will rise in 2020, but severe threats to the climate account for all of the top five long-term risks, according to the WEF's latest Global Risks report.

Read more:

WEF's Global Risks Report 2019 reveals world's biggest concerns

Three years of Xi's Davos speech: How has China championed multilateralism?

The third Senate impeachment trial of a U.S. president in history convened on January 16 with the reading of the impeachment articles against Donald Trump.

The actual arguments will get underway on Tuesday after the Senate conducted its ceremonial functions of the impeachment trial. 

Read more:

Trump on trial: Key players and what happens next

U.S. House impeaches Trump for abuse of power, obstruction of Congress

Day by day 

Monday: EU foreign ministers hold talks on Iran, Libya at the EU headquarters in Brussels, Belgium.

Tuesday: The WEF holds its annual meeting in Davos, Switzerland (to Jan. 24); the U.S. Senate begins the impeachment trial of President Donald Trump.

Wednesday: The Fifth World Holocaust Forum opens at the Yad Vashem Holocaust Memorial and Museum in Jerusalem (to Jan. 23) to mark the 75th Anniversary of the Liberation of Auschwitz; French President Emmanuel Macron visits Palestine.

Thursday: U.S. Secretary of State Mike Pompeo delivers remarks on U.S. foreign policy at the Sumter County Fairgrounds in Bushnell, Florida; Russian President Vladimir Putin visits Palestine.

Friday: German Chancellor Angela Merkel visits Turkey; Britain's Prince Charles visits Bethlehem.

Saturday: Brazilian President Jair Bolsonaro visits India (to Jan. 27).

Sunday: A quiet day for politics.