Category Archives: Sustainability

Russell Hopfenberg on food supply, carrying capacity, and population: follow-up responses to readers’ comments

Administrator’s note: Several months ago GIM was lucky enough to be able to arrange for Dr. Russell Hopfenberg to respond to readers’ comments and questions concerning his important work on the links between food supply, carrying capacity, and population growth. My own summary of that work and its background, along with initial reader comments, is here. Additionally, since I wrote that post, Russ has developed an informative slideshow featuring his ideas. Russ’s responses to those initial comments, and readers’ subsequent questions and comments, are here. If you’re not familiar with the ideas involved and the prior discussion here, those links will help you get up to speed.

Now I’m pleased to post Russ’s follow-up responses to that second batch of reader comments linked to above. To my knowledge, GIM is the only website to have had the chance to present a dialog on this work between Russ and interested readers. The content which has emerged has helped readers better understand these underappreciated ideas. My thanks to Russ for his generosity in participating in this illuminating process! — JF

By Russell Hopfenberg: Farmland

I’d like, once again, to extend my thanks to John Feeney and Steve Salmony for their help with this discussion. Also, thanks to those who participated in this process by either asking questions, responding to my answers, or reading and integrating this information.

Trinifar: For decades the world population growth rate has been declining — see for example here. As Russ says, “… the declining birth rate occurs in countries that have traversed the DT.” It would be interesting to know how much of that decline is due to DT traversal and how much (if at all) to food supply limits.

RH: Regarding the growth rate, this is absolutely true. Now, let’s take a moment to analyze this reality. A growth rate of 3% per year with a population of 2 billion makes the population 2.06 billion the following year — an additional 60 million people. A growth rate of 2% per year, a 1/3 reduction in the growth rate, with a population of 6 billion makes the population 6.12 billion – an additional 120 million people. That’s twice as many additional people as with the higher growth rate!! At some point, our population size will hit the tipping point of ecological disaster and the growth rate won’t matter. As for the DT itself, the DT is a dependent variable. This means that it is a function of something else. That something else is, among other things, food availability. Also, according to the Brundtland Report, it would take more than ten planet earths to usher a population of 6 billion people through to stage 4 of the DT.

Trinifar: Yet it occurs in DT stages 3 and 4 (as Russ notes above) and that includes the US, Canada, Europe, and Japan — a good portion of the world. Is Russ only talking about the parts of the world in DT stages 1 & 2?

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Radio interview

I’ll be appearing this Sunday (12/9) on Free Range Thought, WKNY Radio (1490 AM) out of Kingston NY, with hosts Adam Roufberg and Robert Johnstreet. The show airs at 1:30 pm Eastern time. I should be on at about 1:40. This discussion will likely cover a range of ecological topics including population growth, food production, climate change, and other sustainability related subjects. For those outside the station’s broadcast area an audio file should be posted on the show’s website subsequent to airing.

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Jane Goodall on overpopulation

It’s always worth bringing attention to another respected voice calling for action to address population. This brief video is a section of a broader October, 2007 interview with Jane Goodall:

Notice, at the 1:20 mark in the video, Dr. Goodall’s mention of the appreciation villagers showed for a family planning team sent to assist them. This is consistent with what I’ve gleaned from articles on population concerns in African, Indian, and other newspapers.

There are some who hesitate to condone action to address population growth in developing countries on the grounds that it means imposing the values of those in the First World on other cultures. It’s an understandable concern, but is no justification for doing nothing. Dr. Goodall’s remarks suggest we need to distinguish between “imposing our values” and providing needed, wanted assistance.

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Grim worldview from the deck of the Titanic

Administrator’s note: Jim Lydecker’s essays have appeared previously on GIM. In this one, which first appeared as a guest commentary in the Napa Valley Register, Jim does an especially good job of tying together succinctly a number of the ecological, economic, and political crises we face. He raises, as well, a troubling question: If our elected leaders are fully aware of the challenges facing us, why are they doing next to nothing to address them?

My thanks to Jim for providing this article! — JF
By Jim Lydecker: Titanic

I have written before that America is like the Titanic making her way through an ocean of icebergs. The captain and his staff keep reassuring the passengers everything is OK.

Standing on the deck, we see the bergs getting bigger and closer. Looking up at the captain’s quarterdeck, I wonder if they know what the hell they are doing? Can they be so stupid to not see the impending crises in front of us? Are they focused only on those directly in our path hoping to navigate our way through, fingers crossed?
Or do they know there is no way out and we are doomed?

This allegory is more true than fictional. America faces a convergence of crises of such magnitude that no amount of financial or scientific commitment may be enough to keep them from ending industrial civilization. The future would be less problematic if our leaders had taken on the crises before they became so large and interconnected.
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Well said, Bill

This came up in comments, but I thought it was worth a little more exposure.Bill ClintonFrom Anne E. Kornblut at the Washington Post:

Last week at his library, in a speech at a Slate conference honoring top philanthropists, Clinton sounded almost critical of the presidential candidates, including his wife.

His complaint? None has put the subject of population control in a world with shrinking resources on the 2008 agenda.

“Now, nobody’s going to talk about this in the election this year — in either party — but I ain’t running for anything, I can do it,” he said, saying the world population will be 9 billion by the year 2050.

Among public figures, then, it takes someone no longer nurturing political ambitions to bring up the obvious. Does this mean one day an adult will look down at a child on a bleak, perhaps depopulated earth, and say, “We had a chance to save the earth, but politics got in the way”?

Housekeeping: A bit of travel next week will mean I won’t be able to attend to GIM as regularly as usual. If you leave a comment during that time and it doesn’t show up, it may be caught in the spam filter. Be patient and I’ll set it free as soon as I’m able. Expect a new guest post before that.
Image source: advencap’s photostream,, Creative Commons license

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An economic growth FAQ from the Center for the Advancement of the Steady State Economy

[Update: Since this was posted, the CASSE site, including the FAQ, has been revamped. I encourage you to go there and have a look around!]

Administrator’s note: Though lots of actions play around the edges of helping address our environmental problems, very few get to the heart of the matter. One that does is the promotion of economic policy which rejects the notion of endless economic growth. In that vein, the “steady state economy” is a key alternative model, having grown out of the work of those in the field of ecological economics.

And no one works harder or more effectively to promote the steady state economy than Brian Czech, Ph.D. (and team!) and the Center for the Advancement of the Steady State Economy (CASSE). Trained as a conservation biologist, Brian is today an important contributor to our understanding of ecological economics, which he teaches as a visiting assistant professor at Virginia Tech. He is the author of Shoveling Fuel for a Runaway Train.

Here then, is the CASSE FAQ on economic growth. In few words, it says a great deal, touching on key points involved in the fundamental conflict between economic growth and environmental protection. My thanks to Brian for making it available! Find previous posts on Brian and CASSE here. In a related vein is this recent piece on ecological/steady state economics at Trinifar and this one at The Natural Patriot. — JF
By Brian Czech:

What is economic growth?

Economic growth is simply an increase in the production and consumption of goods and services. It entails increasing population and/or per capita production and consumption. It is measured or indicated by increasing GDP, or gross domestic product.

Why is economic growth a threat to the environment?

The economy exists within the ecosystem. This fact is overlooked in business and economics textbooks, where the economy is portrayed as a circular flow of money between firms and households:


The production of goods and services entails the conversion of natural resources, or “natural capital,” into consumer goods and manufactured capital. This explains why there is a fundamental conflict between economic growth and biodiversity conservation (pdf). Furthermore, pollution is an inevitable byproduct of economic production. The degradation of the environment as a result of economic growth occurs in many ways, but in general, economic growth leaves a larger ecological footprint.

Why is economic growth a threat to economic sustainability, national security, and international stability?

To grow, an economy requires more natural capital, including soil, water, minerals, timber, other raw materials and renewable energy sources. When the economy grows too fast or gets too big, this natural capital is depleted, or “liquidated.” To function smoothly, the economy also requires an environment that can absorb and recycle pollutants. When natural capital stocks are depleted, and/or the capacity of the environment to absorb pollutants is exceeded, the economy is forced to shrink. (more…)

Six steps to “getting” the global ecological crisis

By John Feeney:

[Original version published at The Oil Drum; Revised here for clarity – 11/12/07, 11/17/07, 5/31/08, 8/12/08]


Some of us who examine and discuss environmental matters are constantly puzzled and frustrated by the seeming inability of elected officials, environmental organizations, and environmental and political writers to “get” the nature of our ecological plight. Could it be they’re simply unaware of the ecological principles which enable one to understand it?

Since some undoubtedly are, and in light of the warnings in the UN’s latest report on the state of the global environment, here is a brief list of axioms and observations from population ecology with which everyone should be familiar. Most are taught in introductory level ecology and environmental science classes. They appear sequentially, so the reader can step logically through a progression which should make clear some of the fundamental elements of the global ecological challenge before us: (more…)