DAVOS, Switzerland 

The annual World Economic Forum (WEF) kicked off on Tuesday, with a focus on both U.S. President Donald Trump struggling with domestic impeachment charges and teenage activist Greta Thunberg looking to force the global financial elite to act against climate change. 

About 3,000 people, of whom 24% are women, from 117 countries, are set to gather in the ski town nestled in the Swiss Alps for the 50th anniversary of the four-day WEF.

Trump and German Chancellor Angela Merkel are among 53 state and government heads who will be attending the forum.

In the face of impeachment charges,

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