What Is The Biggest Problem That World Will Face In 21st Century?

In the third world: Poverty, corruption, political unrest, starvation, lack of justice, violence.

In the second world:  Poverty, Fierce competition for work, Fierce competition for school, Fierce competition for less-than-plentiful resources.

In the first world:  Dealing with immigrants from the second and third world: Adjusting them to a society that puts quality of life over work ethic: Disrupting extremist groups who want to disrupt the first world and make it a third world based on a misunderstanding of a) the world b) Spirituality and c) their own importance (of which there is none).

In America:  Deciding whether or not to watch the feature video on youtube. Deciding whether or not to super-size your value meal at McDonalds.  Choosing between the pants with the 50-inch Waistline or the Pants with the Stretchy fabric so you don't have to realize your waist line is bigger than 50 inches.