Professional forecasters like to say that making predictions is difficult, particularly about the future. However, here are some of the key themes — and questions — that look set to shape global events this year.

Will prosecutor Robert Mueller's Russia investigation mark the end of Donald Trump's presidency?

Trump didn't expect to be Time magazine's Man of the Year for 2017, but 2018 could be the year that we get a clearer idea of the legacy he will leave.