Columnist Russ Vernon-Jones: 8 billion of us! — population growth and climate change

  • Russ Vernon-Jones FILE PHOTO

Published: 1/19/2023 5:09:12 PM
Modified: 1/19/2023 5:08:54 PM

Sometime on Nov. 15, 2022, according to demographers, a baby was born somewhere in the world who brought the number of humans living on the planet to eight billion. That’s a lot of us!

How does population growth relate to our efforts to solve the climate crisis? This is a sensitive subject. It can bring up differing viewpoints and strong feelings about everything from women’s rights to religion to racism.

There’s no question that, all other things being equal, more people means more consumption; and more consumption means more stress on multiple global systems, including the climate. However, population growth does not have as large an impact on the climate crisis as one might suspect.

First of all, worldwide population growth has slowed significantly and is now less than 1% per year.

Secondly, most population growth is occurring, and will occur in the coming decades, in sub-Saharan Africa and south Asia — areas of the world where per-capita greenhouse gas emission rates are very low. Population growth in these areas contributes to climate change, but the contribution is quite small compared to the amount of climate change driven by the consumption patterns of people in the wealthy nations. In other words, our over-consumption problem in the wealthy nations is far greater than the population growth problem elsewhere.

Kenya, for instance, has a population of 55 million people — about 95 times the population of the state of Wyoming. Yet Wyoming emits 3.7 times more carbon dioxide than Kenya. According to APNews, “Africa as whole has 16.7% of the world’s population but historically emits only 3% of the global carbon pollution, while the United States has 4.5% of the planet’s people but since 1959 has put out 21.5% of the heat-trapping carbon dioxide.”

The U.S. is one of the nations with the highest per capita emissions — 14.7 metric tons per person per year, compared to the world average of 4.7 t. One might think that a high standard of living and high per capita emissions inevitably go hand in hand. However, some countries with high standards of living have much lower per capita emissions than the U.S. For example: the UK (5.2t), France (4.5t), and Sweden (3.4t). These countries are growing their economies while reducing their emissions and using more renewable energy.

Computer simulations run by scientists at Climate Interactive determined that reducing future population growth by 1.6 billion people would make only a third as much difference as enacting a global tax on carbon of $100/ton.

So, if we want to make a difference in global emissions of greenhouse gases, and we do of course, it makes more sense to focus on reducing the emissions of high-emitting nations than it does to try to pursue population control in the poor nations of African and Asia. As SominiSenguptawrote in the New York Times, “Actually, what matters most is not how many we are. It’s how we live.”

Universal access to voluntary family planning for women, girls, and couples is an essential human right. So is universal access to education for all children. It turns out that when these things are both available, a great many people make good use of them. Education and the availability of family planning services tend to lead to “improved livelihoods, better economic opportunities, delayed onset of marriage, and delayed childbearing” (Project Drawdown). There are many benefits and one of them is slowed population growth.

Project Drawdown’s findings indicate that increased investments in universal education and access to family planning could slow population growth enough to reduce greenhouse gas emissions by 68.9 gigatons between 2020 and 2050. That’s enough to make “Family Planning and Education” one of their top 10 “solutions” for solving the climate crisis.

Almost half (45%) of this reduction in emissions is projected to come from reducing births in the wealthy nations, where per capita emissions are high and many pregnancies are still unwanted. It’s estimated that in the United States, for instance, nearly half of all pregnancies are “unintended,” with 27% “wanted later” and 18% “not wanted.”

Obviously, we should be making education and access to family planning universal as a matter of basic human rights and for all the other benefits that come from them. It is serendipitous that they also have such a beneficial effect on global emissions.

While population growth is not one of the major drivers of global warming in the coming decades, universal education and access to family planning can slow population growth, reduce emissions, and make a significant difference. Even larger differences in global warming can be made by reducing the per capita emissions in the wealthier nations. It will be important to pursue all these strategies as part of our caring for our planet and all its inhabitants.

Russ Vernon-Jones of Amherst was principal of Fort River School for 18 years and is a member of the Steering Committee of Climate Action Now (CAN). The views expressed here are his own. He can be reached at He blogs regularly on climate justice at

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