What is Wrong with the World.
Nothing is wrong with the world, we are caught up in the middle of several co-related phenomena which from our perspective and according to our pre-conceptions are wrong and bad, innately the world is neither good nor bad, it just "is".
The world opperates in a totally neutral way and in accordance with its own laws, as humans we can see the patterns and and understand the world better and better.
If the question however refers to what is wrong with humanity that would be another story, first off humans are confused, mislead and misguided from the sense, this can happen because once again... for nature there is no good or evil, therefore the possibilities can go in any direction of what we are going to learn and how we are going to perceive the world.
Our perception is one of the most powerful if not the most powerful things/phenomena that we are and we have. The world in a way is like a pool of infinity possibility where we filter out what we are unable to use for what we consider self-preservation, that can scale up and down meaning we can consider humanity as a whole as a system as well as individuals of humanity as systems within systems, similar to the relationship between human cells and the human as a whole. The tricky part is understanding what we are from a purely existential perspective simply because we are who we are and it is hard to look back and see who we are, if we do we are no longer that, for example when we identify with something we no longer are aware of that as being a separate subject. Similarly it is tricky to look back into our consciousness, conscious awareness is key here.
Humanity is unaware therefore asleep to a degree in which humanity misses key points or rather fails to consider factors which can aid for their well-being. Essentially humans go against what they want by adopting beliefs, humans adopt many beliefs through their lives and some of them can conflict with their true will, therefore that can cause a lot of problems and a key indicator of such can be an emotion, when trying to numb that signal or any indicator... another seems to take rise simply because energy cannot be destroyed nor created but only transmuted, especially when more and more energy gets spilled out/redirected from somewhere. These are surely abstract concepts however they remain important key points in understanding the roots of human suffering. The world itself is fine in that regard. It is worth noting that most animals are unable of the capacities which lead humans into self-inflicted suffering, this does not mean that they are unable to feel suffering, this means that they are simply not inducing it by themselves to themselves.
There is so much room to explore in regard to these matters which is really interesting, sometimes we have to think out of the box, twist and turn our logic in a way that may seem illogical based on our preconceptions however it might work in the end.