I feel environmental issues are bigger problem than wealth inequality at this point, though both are important and going to have disastrous consequences. I too am not for having kids, we aren't alone in thinking this way. Birth rates are falling in developed nations.
It is hard not to feel angry/pessimistic etc at the state of affairs. In a way, a lot of things have improved - crime rates are down compared to 50 years ago, medicine has made amazing strides, we can travel cheaply across the world, the internet has opened up a ton of opportunities etc. Still, more people are depressed/lonely, salaries are stagnating, there aren't many decent leaders (around the world) that we can look up to... If there is one thing that is guaranteed, it is that humans will mess up any good thing sooner or later :(