What/where are the biggest world problems/conflicts going to be 20 years from now?

hunger

climate

war (instead of countries fighting it will be small terrorist groups around the world against nations)

Well, I guess you don't believe in the 2012 Mayan Calender Theory about the world ending.

Well, in 20 years the world will be over-populated.We will probably run out of food and other natural resources. There also might me a huge famine and a couple of wars. Oh yeah, all the coastal cities are going to start flooding.

We probably might have to revert back to our old instincts as hunter-gathers and nomads.

The Aryan Resistance regains prominence on the global scene to fight the good fight against multiculturalism, leftist liberal policies, and New World Order Zionism. We will prevail.

Crime

Poverty and hunger

Mental health

New diseases and afflictions

Global warming

Natural disasters

global warming and overpopulation

overpopulation- everywhere

hunger- everywhere

global warming- everywhere