We need not worry about our own or the world's future, it's just a matter of time until we fathom absolute reality. When the path, the practice and effort mesh together, results are bound to come. It is essential to have complete confidence in everything the Buddha said. We can't pick out the ideas we want to believe because they happen to be in accordance with what we like anyway and discard others. There are no choices to be made, it's all or nothing.
Tranquility helps concentration to arise.
Dukkha itself can lead us to proper concentration if we handle it properly. But we mustn't reject it, thinking that it is a quirk of fate that has brought all this grief to us, or think that other people are causing it. If we use dukkha to push us onto the path, then proper concentration can result. Right concentration makes it possible for the mind to stretch. The mind that is limited, obstructed and defiled cannot grasp the profundity of the teaching.