from time to time , the real problem of man, depended on the life's period.
1000 years ago , man have different problem than 500 years than now.

Now the real problem its clearly the energy and climate questions.
Energy cause its the motor of our society, and there is less and less energy resources,
and the only energy we know and can use is a disaster for the climate.
Wind turbine and solar panel are false solution because of the batteries that used it to store the electricity, because to manufacture these batteries, it is necessary to crave methane, which pollutes much more than the old diesel cars so ...and thats just one example, there are many other chemical processes that are very bad for the environment.
And to manufacture all of this , we have to extract some rare minerals, with all that implies etc etc ....

One of the best solution at this, will be that we master the nuclear fusion (not fission) like ITER project, but its not for tomorrow...