If you look at the history of the past 2000 years, things are pretty good. There always will be droughts, floods, dystopian political situations. Granted that there are many global problems and some are very difficult to solve. However, each person's future is a result of making their circumstances the best that can be, then focus on their immediate family / friends and work outwards. You don't solve global problems if you can't even get your home-front sorted.

In the greater scheme of things, money is not the issue. Being optimistic and making a difference on your own patch through smart and focused effort is the start. If every person takes that approach then many large scale problems become a lot smaller.