What problems did humanity face in the late 20th and early 21st centuries?

The main problems of this period include global climate change and the state of environmental ecology, which can lead to man-made disasters and natural disasters.
The threat of military action was retrained into terrorism, as well as the conduct of information warfare.
There has been an active division of countries in terms of the level of economy and social benefits, the gap between the rich and the poor has grown several times.
On the territory of many countries, raw materials and political crises have arisen that have lasted for several decades.