I wouldn't make many predictions that far out, because each decade out adds more uncertainties. 2030 isn't too hard to envision, and perhaps we could hit 50/50 predicting 2050.
For a few predictions, the world will probably switch mostly to thorium power or fusion, with few additions to hydro-electric. Solar and wind might peak in the not-too-distant future, as they'll remain more expensive in maintenance and land area and are hard to harden against natural disasters like earthquakes and hurricanes. IR laser power beamed from space is another possibility.
Science, technology, and medicine will obviously advance by leaps and bounds.
Almost all of the world will have advanced to the washing machine and gas cooker stage of technology (a very important milestone that frees up enormous labor).
Western Europe will include several small Muslim countries, and perhaps France itself will face a Muslim majority - or there will have been another nasty war.
The leader of North Korea will be Kim something something.