Human beings are the only intelligent species today. Our intelligence has kept us alive in an environment that is hostile to life by nature, and we will continue to thrive in this environment for many more thousands of years. But it seems that our future as a species does not depend so much on the process of natural selection anymore.
We have developed civilizations, sciences and technologies that for the first time in history enable us to manipulate our own nature. Far from the mechanisms that gave rise to our existence as a species, beyond the detailed developments that have brought us to our current stage of being, it is ourselves, mankind, who have the frightening option of deciding the destiny of our species.