Humans have been around long enough to learn many things. We could provide very well for ourselves a hundred years ago. Since then we have developed countless new capabilities, many of which make it easier to survive. In particular health care, psychology, communication advances, understanding of ecological systems, physics, cybernetics and the knowledge of techniques by which we can grow, design and manufacture useful items. Uncertainty about the future is not due to lack of ability.
Life Strives to Survive.
It is the natural aim of creatures to launch their young into life with as great a chance as possible for raising young of their own. The urge to care for offspring and thereby continue the species predates awareness of self and selfishness. It is at the core of every human being. All but the most dedicated of those who seek salvation through making money recognize the well-being of future generations as the ultimate good. This basic drive in billions of people is more than capable of transforming civilization.