What problems at the turn of the 20th century are still faced today?

Industrialization brought a lot of effects that we still discuss today. Some of them are:
1. Climate change. Humans have been producing CO2 emissions by a lot.
2. Reversing poverty. Some countries still face a lot of poverty and starvation.
3. Population growth. Too many people leads to less resources.
4. Conquering disease. The 1919 Spanish Flu Pandemic is a never forget. Remember ebola? it's not that far too.
5. War. Nuclear tensions are still on-going today, just like during the Cold War. 

Global warming, world peace, endangerment of species, diease, hunger, etc