Personally I see the world as a massively overcrowded place with at least 10 billion individuals competing for ever more scant resources at hand. Weather patterns worldwide will undoubtedly become even more extreme placing even more pressure upon humans.
The USA will be known as a former superpower, much as France and Britain are today.
Religious theocracies such as those currently in the Middle East will not be able to maintain traction under religious authoritarian rule and will likely become former relics of themselves.
How do you see us a species 100 years from now?