In the 1960s , the world was divided into `` developed -- or Western '' and `` developing '' Hans Rosling says the division was relevant in terms of wealth , education and life expectancy . In the world as a whole the main reason for future population growth is that the young generations grow up causing an inevitable fill-up of the adult population . But he says since then , there has been a shift -- with most countries in the middle . The rich are richer than ever before while many people have less money to spend on things like health care and food.
In the 1960s , the world was divided into `` developed -- or Western '' and `` developing '' Hans Rosling says the division was relevant in terms of wealth , education and life expectancy . But he says since then , there has been a shift -- with most countries in the middle . The rich are richer than ever before while many people have less money to spend on things like health care and food.