There are two basic factors that will shape mankind's future, one of them being definite and the other deciding. Our evolution and species development will ultimately give our human race some parts of the future to be uncontrolled. How our mankind uses this advancement throughout time, will give our species a certain amount of controllable future, as well. We must come to terms that the way Man has shaped our present from the past, will now shape it for the future.
Definite
Our evolution and development gives us our definite future. We all change and progress throughout generations, little by little. There is no stopping the evolution process of any kind simply due to the fact that it's the instinct that provides this. Our future generations inevitably will become more advanced and progressed than we are now, thus changing our future dramatically whether we like it or not. For example, if any naturally occurring event took place on Earth 30,000 years from now, we would undoubtedly be more susceptible to handle that situation rather than today. We understand this because our minds would be much greater in power thousands of years from now. This "mind-progression" will result from the natural yet definite future process of evolution.
Deciding
The method on how we decide to use our instincts everyday is what creates the other aspect of our future. This would be the more valuable and realistic factor in which would bring about the world's decidable forthcomings. What good would it be to have all of that evolutionary manpower without actually utilizing it in the proper fashions? This question allows you to think of dreadful outcomes such as governmental failure and environmental hazards if we decide as a society to not apply our available instincts. This in turn leaves us to understand that if we're able to choose on how we establish ourselves as human beings, then we now decide on our future of them.
Understanding How The Past Affects Our Present and Future
We must understand that much of our future for today (and many years to come) was already decided and definitized by our species thousands of years ago in the past and is changing every day. If we look at the past, we can then have a perspective on how it has changed up to the present.
Let's take a glance over at the "definitized" aspect of our future, where we can come to realize that mankind had blatantly changed it unwillingly from the past: in 10,000 B.C. we had very low communication and emotional skills wherein today we have plenty of them. This instinctive inevitability formed the future, undecidedly, to have human being's that could show emotion and communicate by talking to each other. We now have these personal skills that will definitely shape the rest of our future.
Now, if we shift to the other "deciding" element of our future, we can comprehend that mankind has obviously changed it willingly from the past, as well: when we look at our countries on Earth, we should accept that they were all formed by decisions made by society in the past. This in turn, affects how our countries stand today and probably for many years to come until mankind were to make other decisions that would affect such.
My Afterthoughts
We should now notice that the two elements, definite & deciding, is how future becomes and is becoming. We can also see how the past may dramatically shape human beings destiny, as well. Some of our future comes from forced, natural development and other parts from decisions. What will mankind come to be in the future? The answer to that relies within our instinct and the choices we make on how we actually want ourselves, as human's, to become.