3 reasons why human population is increasing

Every day we add 227,000 more people to the planet — and the UN predicts human population will surpass 11 billion by the end of the century. As the world's population grows, so do its demands for water, land, trees and fossil fuels — all of which come at a steep price for already endangered plants and animals.


Current world population:


Global population growth and the destructive consumption habits of high-wealth countries put pressure on biodiversity and human communities, exacerbating food and water shortages, reducing resilience in the face of climate change, and making it harder for vulnerable groups to rise out of intergenerational poverty.


Reproductive health, rights and justice are threatened by the same systems of oppression that overexploit the environment and drive the extinction crisis. But through solutions like gender equity and a just transition to sustainable consumption and production, we can promote human rights; decrease poverty and overcrowding; raise standards of living; and allow people and nature to thrive.


The Center has been working to address the connection between human population pressure and the extinction crisis since 2009. Our innovative campaigns focus on commonsense solutions such as gender empowerment, the education of all people, universal access to all forms of sexual and reproductive healthcare, sustainable and equitable lifestyle choices, an economy that doesn’t rely on endless growth, and a societal commitment to improve living conditions for all species.  

3 reasons why human population is increasing

Endangered Species Condoms offer a fun, unique way to break through the taboo and get people talking about the link between human population growth and the wildlife extinction crisis.

3 reasons why human population is increasing

Most biologists agree we're in the midst of the Earth's sixth mass extinction event; species are disappearing at the greatest rate since dinosaurs roamed the planet. This time, though, it isn't because of geologic or cosmic forces — it's because of our unsustainable growth and consumption.

3 reasons why human population is increasing

As our human footprint reaches farther and farther into remote areas in search of room to build cities, housing developments, golf courses and new farms, we're squeezing wildlife into ever smaller habitat refuges, often leaving endangered species with nowhere to go.

3 reasons why human population is increasing

A 2009 study of the relationship between population growth and global warming determined that the “carbon legacy” of just one child in the United States can produce 20 times more greenhouse gas than a person is able to conserve by taking other energy-saving actions.

Human population growth and consumption are at the root of our most pressing environmental crises, but they’re often left out of the conversation. We can fight to curb climate change, stop habitat loss, and clean up pollution, but if we don't also fight for reproductive justice for those most severely harmed by these environmental crises — including young people, immigrants, Black, Indigenous and people of color, minoritized ethnic and religious groups, LGBTQIA+ communities and rural communities — it'll remain an uphill battle we can't win. The first step to solving a problem is getting people to talk about it.


The Center is working to put the spotlight back on human population growth and the need to fight for reproductive and environmental justice. We're using creative media like our award-winning Endangered Species Condoms to start conversations on a person-to-person basis nationwide; we’re circulating videos to explain the connections between population growth and other environmental problems and highlight the importance of healthcare for all. We're also bringing the message to museums, science centers and classrooms through fun and interactive Pillow Talk events, via virtual and in-person film series, and through social media campaigns.

Supporting Reproductive Justice

Everyone plays a role in human population growth, but when it comes to reproductive decisions, women and gender-diverse people are disproportionately affected by a lack of empowerment and access to healthcare, which not only affects their reproductive futures but also income and wealth equity, education, and leadership opportunities. Many people worldwide and in the United States are unable to get the sexual and reproductive healthcare they want or need. Unfortunately U.S. lawmakers and courts are currently doing everything they can to restrict reproductive freedom, including bans on comprehensive sex education and abortion.

Reproductive justice is environmental justice. In order to make sure we leave room for wildlife, it's critical that every pregnancy is planned and that people have the ability to decide when — or if — they want their family to grow. When people have access to voluntary contraception and equal education, they tend to choose to delay childbearing and have smaller families, leading to lower fertility rates.

The Center supports unfettered access to education, reproductive healthcare and gender equity for all. Every person should have the tools, information and autonomy to make the best reproductive choice for themselves and the planet.

Conversations about overpopulation can quickly become controversial because they beg the question: Who exactly is the cause of the problem and what, if anything, should be done about it? Many population experts worry discussions around overpopulation will be abused by small-minded people to suggest some are the “right people” to be on the planet (like themselves), and some people are “the wrong people” (usually people in poverty, people of color, foreigners, and so on—you get the drift). But there are no “right” or “wrong” people on the planet, and discussing the problems of global overpopulation can never be an excuse, or in any way provide a platform, for having that type of conversation.

Each human being has a legitimate claim on a sufficient and fair amount of Earth’s resources. But with a population approaching 8 billion, even if everyone adopted a relatively low material standard of living like the one currently found in Papua New Guinea, it would still push Earth to its ecological breaking point. Unfortunately, the “average person” on Earth consumes at a rate over 50% above a sustainable level. Incredibly, the average person in the United States uses almost five times more than the sustainable yield of the planet.

When we use the term “overpopulation,” we specifically mean a situation in which the Earth cannot regenerate the resources used by the world’s population each year. Experts say this has been the case every year since 1970, with each successive year becoming more and more damaging. To help temper this wildly unsustainable situation, we need to understand what’s contributing to overpopulation and overconsumption and how these trends are affecting everything from climate change to sociopolitical unrest.

The Causes of Overpopulation

Today the Earth is home to more than 7.8 billion people. By 2100 the population is on track to hit 10.8 billion, according to the United Nations — and that’s assuming steady fertility declines in many countries. Interestingly, if extra progress is made in women’s reproductive self-determination, and fertility falls more than the United Nations assumes is likely, the population in 2100 might be a relatively smaller 7.3 billion.

For now, the world’s population is still increasing in huge annual increments (about 80 million per year), and our supply of vital non-renewable resources are being exhausted. Many factors contribute to these unsustainable trends, including falling mortality rates, underutilized contraception, and a lack of education for girls.

Falling Mortality Rate

The primary (and perhaps most obvious) cause of population growth is an imbalance between births and deaths. The infant mortality rate has decreased globally, with 4.1 million infant deaths in 2017 compared to 8.8 million in 1990, according to the World Health Organization (WHO). This is welcome public health news, of course.

At the same time, lifespans are increasing around the world. Those of us who are alive today will likely live much longer than most of our ancestors. Global average life expectancy has more than doubled since 1900, thanks to advancements in medicine, technology, and general hygiene. Falling mortality rates are certainly nothing to complain about either, but widespread longevity does contribute to the mathematics of increasing population numbers.

Underutilized Contraception 

The global fertility rate has fallen steadily over the years, down from an average of 5 children per woman in 1950 to 2.4 children per woman today, according to the UN Population Division. Along with that promising trend, contraceptive use has slowly but steadily increased globally, rising from 54% in 1990 to 57.4% in 2015. Yet, on the whole, contraceptive use is still underutilized. For example, according to the WHO, an estimated 214 million women in developing countries who want to avoid pregnancy are not using modern contraceptives.

These women aren’t using contraceptives for a variety of reasons, including social norms or religious beliefs that discourage birth control, misconceptions about adverse side effects, and a lack of agency for women to make decisions around sex and family planning. An estimated 44% of pregnancies were unintended worldwide between 2010-2014. Getting more women the access and agency to utilize family planning methods could go a long way in flattening the population curve.

Lack of Female Education    

Although female access to education has increased over the years, the gender gap remains. Roughly 130 million girls worldwide are out of school currently, and an estimated 15 million girls of primary school age will never  learn to read and write, compared with 10 million boys.

Increasing and encouraging education among women and girls can have a number of positive ripple effects, including delayed childbearing, healthier children, and an increase in workforce participation. Plenty of evidence suggests a negative correlation between female education and fertility rates.

If increased female education can delay or decrease fertility and provide girls with opportunities beyond an early marriage, it could also help to mitigate current population trends. 

The Effects of Overpopulation

It is only logical that an increase in the world’s population will cause additional strains on resources. More people means an increased demand for food, water, housing, energy, healthcare, transportation, and more. And all that consumption contributes to ecological degradation, increased conflicts, and a higher risk of large-scale disasters like pandemics.  

Ecological Degradation 

An increase in population will inevitably create pressures leading to more deforestation, decreased biodiversity, and spikes in pollution and emissions, which will exacerbate climate change. Ultimately, unless we take action to help minimize further population growth heading into the remainder of this century, many scientists believe the additional stress on the planet will lead to ecological disruption and collapse so severe it threatens the viability of life on Earth as we know it. 

Each spike in the global population has a measurable impact on the planet’s health. According to estimates in a study by Wynes and Nicholas (2017), a family having one fewer child could reduce emissions by 58.6 tonnes CO2-equivalent per year in developed countries.

Increased Conflicts 

The scarcity brought about by environmental disruption and overpopulation has the potential to trigger an increase in violence and political unrest. We’re already seeing wars fought over water, land, and energy resources in the Middle East and other regions, and the turmoil is likely to increase as the global population grows even larger.

Higher Risk of Disasters and Pandemics 

Many of the recent novel pathogens that have devastated humans around the world, including COVID-19, Zika virus, Ebola, and West Nile virus, originated in animals or insects before passing to humans. Part of the reason the world is entering “a period of increased outbreak activity” is because humans are destroying wildlife habitats and coming into contact with wild animals on a more regular basis. Now that we’re in the midst of a pandemic, it has become clear how difficult it is to social distance in a world occupied by nearly 8 billion people.   

What Can Be Done? 

When addressing overpopulation, it’s crucial to take an approach of providing empowerment while mobilizing against anybody advocating for the use of coercion or violence to solve our problems. The combined efforts of spreading knowledge about family planning, increasing agency among women, and debunking widely held myths about contraception will measurably change the trajectory of the world’s population.

As we carry out our work at Population Media Center (PMC), we see first-hand that spreading awareness about family planning methods and the ecological and economic benefits of having smaller families can change reproductive behavior. For example, listeners of our Burundian radio show Agashi (“Hey! Look Again!”) were 1.7 times more likely than non-listeners to confirm that they were willing to negotiate condom use with a sexual partner and 1.8 times more likely than non-listeners to say that they generally approve of family planning for limiting the number of children.

At PMC we harness the power of storytelling to empower listeners to live healthier and more prosperous lives, which in turn contributes to stabilizing the global population so that people can live sustainably with the world’s renewable resources. Discover how PMC is taking action against overpopulation today!