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As human numbers approach 7 billion, the question is, "Where do we go from here?"

The U.N. recently published new population projections, which envision a range of possibilities for the 21st century. In the U.N.'s low projection, our numbers peak at 8 billion by mid-century, then decline to 6 billion by 2100. By contrast, the medium and high projections envision continued growth for the foreseeable future. According to the medium projection, the world's population would reach 10 billion by 2100; according to the high projection, nearly 16 billion.

Now, I don't believe there is an optimal size for the human population; greater equity and more efficient use of resources would greatly extend the planet's "carrying capacity." Yet, when you consider the resource challenges of the 21st century, 8 billion certainly looks more sustainable than 16 billion.

Take water, for example. While there is no global shortage of water, a growing number of regions are chronically parched. And many of those regions are also where population is growing most rapidly. In the world's most " water poor " countries, population is expected to double by 2050. Slower growth is not a panacea for the world's water problems, but it could ease pressure on scarce resources and buy time to craft solutions.

The good news is that we know how to slow population growth. Over the last half century, we've learned that the best way to slow growth is not through coercive "population control," but by ensuring that all people are able to make real choices about childbearing.

Women's rights are key. Fertility rates remain high where women's status is low. Fewer than one-fifth of the world's countries will account for nearly all of the world's population growth this century. Not coincidentally, those countries - the least developed nations in sub-Saharan Africa, south Asia, and elsewhere - are also where girls are less likely to attend school, where child marriage is common, and where women lack basic rights.

That can change. Nations can raise women's status by educating girls, by enforcing laws that prohibit child marriage, and by improving women's access to credit, land, training, and jobs. Where women enjoy these fundamental rights, smaller (and healthier) families become the norm.

At the same time, women need the means to make choices: family planning and other reproductive health services. Around the world, some 215 million want to avoid pregnancy, but aren't using effective methods of contraception. Fulfilling that "unmet need" for family planning would require an additional $3.6 billion [PDF] annually; the U.S. share of the cost (based on a formula developed by the U.N. Population Fund) is about $1 billion [PDF].

And the potential benefits are huge: Improved access to family planning could prevent 53 million unintended pregnancies, 150,000 maternal deaths, and 25 million abortions each year.

Women's rights and reproductive health are vitally important in their own right, as a matter of public health and social justice. They can also help slow population growth and help ensure a sustainable future.
Read more in this vein from Laurie Mazur and more on women's rights and population.

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Women's rights are key to slowing population growth

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As human numbers approach 7 billion, the question is, "Where do we go from here?" The U.N. recently published new population projections, which envision a range of possibilities for the 21st century. In the U.N.'s low projection, our numbers peak at 8 billion by mid-century, then decline to 6 billion by 2100.

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In African countries the life expectancy is lower than in the western world. One of the reasons is the amount of children each woman give birth to. When parents have about 7 children, its much harder to secure their helth and their needs. They end up being poor, and their life expectancy results in being lower.

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In Roslings presentation, we can see him talking about child survival. When the percent of child survival increases, it can change the overpopulation in a better way. After this decade the population will change, and start reducing. Looking at statistics, as the one underneath we clearly see the positive differences.

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Poverty is one of the main reasons to overpopulation. First of all, in poor countries its harder to get your hands on contraceptives. This leads to people having more babies, which leads to overpopulation. In poor countries

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New studies show that the greatest impact people can have on the environment, is to have fewer children. To avoid severe global warming, we need to fall down to two tonnes of CO2 per person before year 2050. Currently, the USA, Australia and the UK have more than 15 tonnes of CO2 per person.
Rosling states that the population will reach 10 billion, and then it will stay there. When he made that statement, he estimates that every woman will get 2,1 children on average. However, if every woman gets one fewer child, it will have a huge impact on the clomate and the CO2 in the atmosphere.

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The Man, The Myth, The legend. Our whole task started with one humble man, and his journey to reach nirvana.