The last three decades have seen unprecedented progress when it comes to reducing extremepoverty around the world--but there's still an awful lot more to do.

Roughly 721 million people were lifted out of extremepoverty -- defined internationally as living on less than $1.25 a day -- between 1981 and 2010, according to a new report by the World Bank released Thursday. The United Nations' Millennium Development Goal of halving the share of people in extremepoverty between 1990 and 2015--an aim set at a summit in 2000--was reached in 2010, five years early.

But, as the World Bank points out, that still leaves roughly 1.2 billion people completely destitute, including about 400 million children. One of every three extremely poor people is a child under the age of 13. (To put all this in perspective, America's own poverty line amounts to about $60 a day for a family of four -- as the Economist noted in June. People around the world in 'extreme poverty' tend to lack enough food to meet basic physical and mental needs.)

The World Bank report zeros in on the relative lack of progress in the world's 35 'low income' countries -- places like Bangladesh, Chad, Haiti and Kenya. Progress in these countries will need to pick up if international goals to eliminateextremepoverty by 2030 are to be reached.

Judging from the daily incomes of the extremely poor around the world, extremepoverty is getting less deep. Poverty for middle- and high-income countries -- everywhere from Pakistan, Ukraine and the Czech Republic to Chile and Jordan -- fell by more than 50% since 1981.

But when you look closely at the recent progress in the developing world, much of it is due to China and, to a lesser extent, India, whose amped-up economic growth in recent years reduced their poverty rates. By contrast, extremepoverty in the 35 'low income' countries -- 26 are in Africa -- fell by less than 33%. Indeed, the number of extremely poor people in low-income countries actually rose by 103 million between 1981 and 2010. And around half of the children in low-income countries are in extreme poverty.