As stated in the main page a wicked problem is
A wicked problem is a problem that is difficult or impossible to solve because of incomplete, contradictory, and changing requirements that are often difficult to recognize. It refers to an idea or problem that cannot be fixed, where there is no single solution to the problem…[ Wikipedia ]
Even though we can not fully define the problems we can define its threads. You do not have to look further. If you are motivated to act then knowing the details of what we face may not be useful. So only go as far as you need to. Once you are convinced return to the previous page and continue on.
Providing for Humanity
Overwhelming The Biosphere
Coordination on a Planetary Scale
Commentary
References
Moral Priorities