I don't know for sure but based on everything I'm reading lately, I'm slowly reaching a conclusion that overpopulation is fast hurting and destroying the planet from an environmental standpoint and living condition standpoint. Climate change is not helping things either but humans are the ones causing climate change for the most part.
With overpopulation, rents and housing will continue to be very expensive for much of the world, and only get higher. For example, in NY and California, places where population growth is high, rents and housing prices there are through the roof. Food will only get more expensive as resources and water dry up, and we're at about 7 billion people now. Refugees from across the globe are at record highs, as governments throughout the Middle East, Asia, and Africa are unable to take care of the ever growing amount of people. Europe is already seeing populations shrink, as cost of living there is already high.
Humans are consuming too many resources at too quickly a pace as well according to scientists, and with limited resources, wars and conflicts will only increase. The world already has more refugees now than almost any other time in world history.
So basically, is overpopulation the world's BIGGEST problem? Or are there other issues more important? Many will say the world can fit enough humans on much smaller land but our resources and water supplies can't last forever at this pace.