I've always found myself quite interested about the idea of thinking what will be, in our future. A few decades, a few centuries... Of course the former is much, much easier to do with a ready degree of certainty (even if with that you're bound to be wrong on at least half of any predictions that may be made), and the latter is pretty much impossible. I've always wanted to compile a list of things that would happen in our future and really think about how things might turn out. Now that I've said enough times that I find the topic fascinating in different words, before getting to the topic at hand, this prediction assumes we don't annihilate ourselves, and is also as optimistic as I think it can be:

1. Global warming will have ravaged the planet in such a way where vast parts of the globe are uninhabitable, whether to do with heat or with going underwater.
   1. Some coastal areas will need to be evacuated, with an estimated roughly 3 foot rise in sea level by 2070.
   2. Globally, the average temperature will be roughly 3 degrees Celsius (or 5.5 degrees Fahreinheit) warmer than today. Most of the Middle East, northern Africa, and parts of Central America will be rendered unsuitable for human life.
2. The global population will be roughly 11 billion, even after the near extinction of middle-easterners by xenophobic lawmakers (the likes of Trump of course).
3. We will have chips implanted into us plausibly in the first days of our lives. These chips will track your movements and can also be modified to grant you a heads-up display of sorts. These chips will likely also allow you to have mental access to the equivalent of today's internet.
4. The US, China, and India will all no longer be world powers. I personally predict, though this will likely be wrong, that we will have a single state spanning the globe whose biggest influences are the districts that are today's Norway and Japan. This will more than likely have been prompted by yet another close call with nuclear annihilation.
5. Cars will pretty much have made a complete transition away from gasoline, to a different source of energy altogether. Perhaps smaller scale nuclear fusion engines (using the fusion of hydrogen atoms to create energy much like our Sun) will be available to the richer of the public, while everyone else will end up with electric cars.
6. Yes, nuclear fusion energy will be a thing and will quite likely power most of what we do. It will be substantially cleaner than our current unrenewable sources of power. However, it will still require some sort of backbone from a more primitive source of power, plausibly solar after new innovations in the area (one is taking place right now).
7. Poverty will be pretty much solved for the most part by the implementation of a global Universal Basic Income or Negative Income Tax. Healthcare will be payed by the state from money they get through taxes. Education will be free at all levels, as is already the case in some more developed nations (and yes, it DOES work, stop politicizing a one-sided issue).
8. We will have colonies on the Moon and Mars, maybe also on Venus. These colonies will likely be very culturally different from us here on Earth and from all indications will end up outlasting our civilization on Earth, thanks to global warming and the more conservative/centrist and corrupt mainstream of our times failing to act.
9. Quantum computers will be much more than a reality, they'll run most all of the supercomputers and private network servers of tomorrow.
10. Human memories will be able to be downloaded onto computers, however they will still not have figured out quite how to emulate consciousness in machines, so the memories will sit.

I'll probably put more predictions here in the not so distant future. Also locked because I know if I don't somebody's going to be angry about how certain facts don't align with their feelings.