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She's a 40-year-old mother of eight, with a ninth child due soon. The family homestead in a Burundi village is too small to provide enough food, and three of the children have quit school for lack of money to pay required fees.
"I regret to have made all those children," says Godelive Ndageramiwe. "If I were to start over, I would only make two or three."
At Ahmed Kasadha's prosperous farm in eastern Uganda, it's a different story.
"My father had 25 children I have only 14 so far, and expect to produce more in the future," says Kasadha, who has two wives. He considers a large family a sign of success and a guarantee of support in his old age.
By the time Ndageramiwe's ninth child arrives, and any further members of the Kasadha clan, the world's population will have passed a momentous milestone. As of Oct. 31, according to the U.N. Population Fund, there will be 7 billion people sharing Earth's land and resources.
In Western Europe, Japan and Russia, it will be an ironic milestone amid worries about low birthrates and aging populations. In China and India, the two most populous nations, it's an occasion to reassess policies that have already slowed once-rapid growth.
But in Burundi, Uganda and the rest of sub-Saharan Africa, the demographic news is mostly sobering as the region staggers under the double burden of the world's highest birthrates and deepest poverty. The regional population of nearly 900 million could reach 2 billion in 40 years at current rates, accounting for about half of the projected global population growth over that span.
"Most of that growth will be in Africa's cities, and in those cities it will almost all be in slums where living conditions are horrible," said John Bongaarts of the Population Council, a New York-based research organization.
Is catastrophe inevitable? Not necessarily. But experts say most of Africa and other high-growth developing nations such as Afghanistan and Pakistan will be hard-pressed to furnish enough food, water and jobs for their people, especially without major new family-planning initiatives.
"Extreme poverty and large families tend to reinforce each other," says Lester Brown, the environmental analyst who heads the Earth Policy Institute in Washington. "The challenge is to intervene in that cycle and accelerate the shift to smaller families."
Without such intervention, Brown says, food and water shortages could fuel political destabilization in developing regions.
"There's quite a bit of land that could produce food if we had the water to go with it," he said. "It's water that's becoming the real constraint."
The International Water Management Institute shares these concerns, predicting that by 2025 about 1.8 billion people will live in places suffering from severe water scarcity.
According to demographers, the world's population didn't reach 1 billion until 1804, and it took 123 years to hit the 2 billion mark in 1927. Then the pace accelerated 3 billion in 1959, 4 billion in 1974, 5 billion in 1987, 6 billion in 1998.
Looking ahead, the U.N. projects that the world population will reach 8 billion by 2025, 10 billion by 2083. But the numbers could be much higher or lower, depending on such factors as access to birth control, infant mortality rates and average life expectancy which has risen from 48 years in 1950 to 69 years today.
"Overall, this is not a cause for alarm the world has absorbed big gains since 1950," said Bongaarts, a vice president of the Population Council. But he cautioned that strains are intensifying: rising energy and food prices, environmental stresses, more than 900 million people undernourished.
"For the rich, it's totally manageable," Bongaarts said. "It's the poor, everywhere, who will be hurt the most."
The executive director of the U.N. Population Fund, former Nigerian health minister Babatunde Osotimehin, describes the 7 billion milestone as a call to action especially in the realm of enabling adolescent girls to stay in school and empowering women to control the number of children they have.
"It's an opportunity to bring the issues of population, women's rights and family planning back to center stage," he said in an interview. "There are 215 million women worldwide who need family planning and don't get it. If we can change that, and these women can take charge of their lives, we'll have a better world."
But as Osotimehin noted, population-related challenges vary dramatically around the world. Associated Press reporters on four continents examined some of most distinctive examples:
THE ASIAN GIANTS
It's 6 p.m. in Mumbai, India's financial hub, and millions of workers swarm out of their offices, headed to railway stations for a ride home. Every few minutes, as a train enters the station, the crowd surges forward.
For nearly 7 million commuters who ride the overtaxed suburban rail network each work day, every ride is a scramble. Each car is jam-packed; sometimes, riders die when they lose their foothold while clinging to the doors.
Across India, the teeming slums, congested streets, and crowded trains and trams are testimony to the country's burgeoning population. Already the second most populous country, with 1.2 billion people, India is expected to overtake China around 2030 when its population soars to an estimated 1.6 billion.
But even as the numbers increase, the pace of the growth has slowed. Demographers say India's fertility rate now 2.6 children per woman should fall to 2.1 by 2025 and to 1.8 by 2035.
More than half of India's population is under 25, and some policy planners say this so-called "youth dividend" could fuel a productive surge over the next few decades. But population experts caution that the dividend could prove to be a liability without vast social investments.
"If the young population remains uneducated, unskilled and unemployable, then that dividend would be wasted," says Shereen Jejeebhoy, a Population Council demographer in New Delhi.
Population experts also worry about a growing gender gap, stemming largely from Indian families' preference for sons. A surge in sex-selection tests, resulting in abortion of female fetuses, has skewed the ratio, with the latest census showing 914 girls under age 6 for every 1,000 boys.
Family planning is a sensitive issue. In the 35 years since one government was toppled for pursuing an aggressive population control program, subsequent leaders have been reluctant to follow suit.
For now, China remains the most populous nation, with 1.34 billion people. In the past decade it added 73.9 million, more than the population of France or Thailand.
Nonetheless, its growth has slowed dramatically and the population is projected to start shrinking in 2027. By 2050, according to some demographers, it will be smaller than it is today.
"It's like a train on the track that's still moving but the engine is already off," says Gu Baochang, a professor of demography at Beijing's Renmin University.
In the 1970s, Chinese women had five to six children each on average. Today China has a fertility rate the number of children the average woman is expected to have in her lifetime of around 1.5, well below the 2.1 replacement rate that demographers say is needed to keep populations stable in developed countries.
Three decades of strict family planning rules that limit urban families to one child and rural families to two helped China achieve a rapid decline in fertility but the policy has brought problems as well.
Before long, there will be too few young Chinese people to easily support a massive elderly population.
Also, as with India, there's a gender gap. The United Nations says there are 43 million "missing girls" in China because parents restricted to small families often favored sons and aborted girls after learning their unborn babies' gender through sonograms.
"China is always so proud of how quickly we brought down fertility from high to low, and how many births were avoided but I think we did it too quickly and reduced it to too low a level," says Gu. "I wish that India can learn this: 'Don't make it too quick.'"
WESTERN EUROPE AND THE U.S.
Spain used to give parents 2,500 euros (more than $3,000) for every newborn child to encourage families to reverse the country's low birth rate. But the checks stopped coming with Spain's austerity measures, raising the question of who will pay the bills to support the elderly in the years ahead.
It's a question bedeviling many European countries which have grappled for years over how to cope with shrinking birth rates and aging populations and are now faced with a financial crisis that has forced some to cut back on family-friendly government incentives.
Spain and Italy, both forced to enact painful austerity measures in a bid to narrow budget deficits, are battling common problems: Women have chosen to have their first child at a later age, and the difficulties of finding jobs and affordable housing are discouraging some couples from having any children at all.
In 2010, for the fourth consecutive year, more Italians died than were born, according to the national statistics agency. Italy's population nonetheless grew slightly to 60.6 million due to immigration, which is a highly charged issue across Europe.
Italy's youth minister Giorgia Meloni said earlier this year that measures to reverse the birth rate require "millions in investment" but that the resources aren't available.
Unlike many countries in Europe, France's population is growing slightly but steadily every year. It has one of the highest birth rates in the European Union with around 2 children per woman.
One reason is immigration to France by Africans with large-family traditions, but it's also due to family-friendly legislation. The government offers public preschools, subsidies to all families that have more than one child, generous maternity leave, and tax exemptions for employers of nannies.
Like France, the United States has one of the highest population growth rates among industrialized nations. Its fertility rate is just below the replacement rate of 2.1 children per woman, but its population has been increasing by almost 1 percent annually due to immigration. With 312 million people, the U.S. is the third most populous country after China and India.
Lagos, Nigeria, is expected to overtake Cairo soon as Africa's largest city. Private water vendors there do a brisk business in the many neighborhoods that otherwise lack access to potable water.
The drone of generators is omnipresent, at offices and markets, in neighborhoods rich and poor, because the power grid doesn't produce enough power. Periodic blackouts extend for hours, days, sometimes weeks.
Such is daily life in Nigeria's commercial capital, where the population is estimated at 15 million and growing at 6 percent or more each year. Problems with traffic congestion, sanitation and water supplies are staggering; a recent article in UN-Habitat said two-thirds of the residents live in poverty.
The rest of Nigeria isn't growing as fast estimates of its growth rate range from 2 percent to 3.2 percent. But it's already Africa's most populous country with more than 160 million people.
Ndyanabangi Bannet, the U.N. Population Fund's deputy representative in Nigeria, notes that 60 percent of the population is under 30 and needs to be accommodated with education, training and health care.
"It is a plus if it is taken advantage of," he said of Nigeria's youth. "But if it is not harnessed, it can be a challenge, because imagine what hordes of unemployed young people can do."
In Uganda, another fast-growing country, President Yoweri Museveni used to be disdainful of population control and urged Ugandans, especially in rural areas, to continue having large families.
Recently, the government has conceded that its 3.2 population growth rate must be curbed because the economy can't keep pace. Earlier this year, anti-government protests by unemployed youths and other aggrieved Ugandans flared in several communities, and nine marchers were killed in confrontations with police.
"The government has been convinced that unless it invests in reproductive health, Uganda is destined to a crisis," says Hannington Burunde of the Uganda Population Secretariat.
Among those who are struggling is John Baliruno, 45, of Mpigi in central Uganda, a father of nine.
"I never intended to have such a big number," he said. "I with my wife had no knowledge of family planning and ended up producing one child after another. Now I cannot properly feed them."
Looking ahead, he's pessimistic.
"The environment is being destroyed by the growing population. Trees are being cut down in big numbers and even now we can't get enough firewood to cook food," he said. "In the near future, we will starve."
Another of the fastest-growing countries is Burundi. With roughly 8.6 million people, it's the second most densely populated African country after neighboring Rwanda.
Omer Ndayishimiye, head of Burundi's Population Department, said continued high growth coincides with dwindling natural resources. Land suitable for farming will decline, and poverty will be rampant, he said, noting that 90 percent of the population live in rural areas and rely on farming to survive.
The government has been trying to raise awareness about the demographic challenges among the clergy, civic leaders and the general public.
"We are suggesting couples to go to health clinics to get taught different birth control methods," Ndayishimiye said. "But we are facing some barriers ... Many Burundians still see children as source of wealth."
At her modest house in Gishubi, Godelive Ndageramiwe ponders the changes that have made her regret her large family.
"Children were a good labor force in the past when there was enough space to cultivate," she said. "Today I can't even feed my family properly. My kids just spend days doing nothing."
After her fourth child, she began to worry how her family could be cared for.
"But my husband was against birth control and wanted as many children as possible," she said. "It was delicate because he could marry another wife.
"My friends advised me to go to a nearby clinic, but I was told I must come with my husband. Now I have laid the issue in the hands of God."
On the Web
O U.N. Population Fund • http://www.unfpa.org/public
Population Council • http://www.popcouncil.org