Showing posts with label urban ecology. Show all posts
Showing posts with label urban ecology. Show all posts

Saturday, July 30, 2011

Co-evolution from another angle

As exemplified by this Economist cover article, the concept of the Anthropocene is getting lots of attention. While exemplifying the idea of co-evolution, that is that natural and social systems are engaged in a dance of mutual influence and shifting adaptive landscapes -- the primary focus is on how humans have altered the biosphere.

A recent NYTimes article takes a different approach, documenting various animal adaptations to the urban environment.
White-footed mice, stranded on isolated urban islands, are evolving to adapt to urban stress. Fish in the Hudson have evolved to cope with poisons in the water. Native ants find refuge in the median strips on Broadway. And more familiar urban organisms, like bedbugs, rats and bacteria, also mutate and change in response to the pressures of the metropolis. In short, the process of evolution is responding to New York and other cities the way it has responded to countless environmental changes over the past few billion years. Life adapts.

Monday, November 29, 2010

Geoffrey West on Scaling Rules

Physicists really like simplicity and elegance. And, as a result, they have a wonderful knack for coming up with interesting ways that show how things that appear to be different are really the same.

(Warning: obscure sociology reference impending.) Simmel would love them. (Explanation of obscure reference: Simmel, the progenitor of formal sociology and what has subsequently become network analysis, was treated poorly by the German academic establishment -- in part because his lectures were so popular. Those lectures typically took the following structure: Look at thing A, Look at thing B, Look at thing C. Surprise A, B and C are really the same thing!)

That is the same general approach that West takes as part of this Yahoo Labs Big Thinker presentation exploring the scaling rules of cities, businesses and other things only discovered when you watch!



Unfortunately, the viewer doesn't display time, so I can't identify precisely where to find the interesting bits, ..... but somewhere between a fifth and a quarter into the talk you find this slide which is attached to an interesting observation:

a) there is a systematic relationship between the size of a biological organism and the amount of energy that it requires that b) remains the same over the entire 27 orders of magnitude of biological phenomenon (i.e., from below the cellular level to the blue whale). An increase in size of the system by 4 orders of magnitude requires only 3 orders of magnitude increase in energy input.

At about the 1/4 point, after talking about a number of other scaling relationships, Wests suggests that it is networks that underpin these relationships and the existence of the mathematical relations is a product of natural selection (which has optimized the design and selected for the most efficient) and the mathematics of network processes.

At about the 1/3 point, he notes that similar scaling processes occur not only when looking between species, but also when conceptualizing networks made up of the same object. Thus, the same principals that hold for a single tree also hold for the forest as a whole. Thus, for example when looking at all the different trees in a forest, there is a consistent relationship between the diameter of the trunk of a particular type of tree and the number of trees of that type in the forest.

He then turns to a discussion of growth -- based on the idea that incoming metabolized energy serves two functions a) the maintenance of existing cells and b) the growth of new cells. The first half of the talk, dealing with biological systems, is summarized in the following slide:

The central point is that the relationships are found in biology because natural selection has operated on the systems and selected for those which are optimized. Thus, the question for the second half of the talk becomes whether or not social systems show the same patterns. If they do, then they are likely sustainable. If they don't, problems are likely.



This slide, around the half way mark, summarizes the results of his empirical findings -- that social organization scales in terms of three different types of relationship rather than the single one characterizing biological systems.





And here, in contrast to biological processes that scale at a less than linear rate, we see the consequences of that aspect of social process that scales at a greater than linear rate. Thus, where biological systems that are large go slower than those that are small, social systems that are large operate at a pace that is faster than those that are small.

At this point, around 2/3 of the way through, it gets really interesting. In contrast to interpreting the exponential growth in terms of the standard Limits to Growth argument, West notes that you can 'reset' the initial conditions and, hence, modify the curve, through the process of social innovation. But, drum roll for the long awaited punchline,to do this and keep the system operating requires it to be 'reset' on a more and more rapid basis. In other words, there is a need not just for new innovation, but for more rapid and more fundamental innovation, as the system grows. This structure, like trying to run on a treadmill that is continuously accelerating and from which you will ultimately fall off, is unsustainable.

West closes with a discussion of corporations and the tension between infrastructure (governed by biological type scaling laws that are less than linear) and innovation (governed by scaling laws greater than one) and why companies, in contrast to cities, tend to die out.

There are lots of interesting parallels between West's argument and those of Tad Homer-Dixon and his notion of the ingenuity gap. Homer-Dixon argues that the fundamental problem we face is that the requirement for ingenuity is rising faster than our ability to supply it and, hence, there exists an ingenuity gap. I've always conceptualized the main driver behind the increased requirement as the increasing complexity, scale and fundamental nature of the problems we face. Or, in panarchy terms, the co-creation of increasingly higher-level (slower, larger scale) adaptive cycles. West provides a slightly different explanation for the increased requirement for ingenuity -- tracing it to the increasingly rapid need to 'reset' the growth curve.

Monday, July 12, 2010

Downsized Detroit Becomes Beacon of Urban Farming

One-third of Detroit's land area has been depopulated, leaving "abandoned houses, vacant lots and vacant factories," according to a story in the Guardian UK. Swaths of razed house lots are being taken over by city residents and farmed in small plots for vegetables, fruits and bee-keeping. There's even a million-dollar 40-acre commercial farm near the downtown that has begun operations. Most of the food is grown cooperatively and is available to neighbourhood residents for free at harvest time. The coop gardeners are worried about the takeover of their plots by commercial farming and have formed their own coalition of cooperative gardens to protect their right to farm. Thus far the two business models are doing well side-by-side. A short video by the Guardian interviews a cooperative farmer and a bee-keeper. The video is interesting because it encapsulates the growth and decline cycle of what was once a sprawling metropolis, and it shows that people can survive both ends of the cycle. Interestingly, Los Angeles has begun a Transition movement that is doing the same kind of work. While LA has not experienced the same kind of decline as Motor City, Detroit has become a model for dealing with urban de-growth and decline which some expect to be a common occurrence in other large US cities.

The resurgence of urban farming in Detroit was the one of the central solutions put forward at the US Social Forum which was held in Detroit in June, 2010.

Declaration adopted by the Ecojustice People’s Movement Assembly at the US Social Forum, in Detroit, June 2010:

"Detroit is a window into the future. Through this window we see an inspiring site of deeply grassroots and living visions of a just and democratic community. Community resistance to corporate polluters in Detroit, including oil refineries, coal power plants and the world’s largest waste incinerator, continue to hold the frontline against the destruction of the planet. Meanwhile resistance to such corporatization strategies such as predatory lending, water privatization, prisons and police brutality are matched with equally powerful models of resilience; such as community gardens, cooperative economics, freedom schools and transformative justice. Detroit can be a model of the Just Transition to sustainable communities that we require; one in which exploitive jobs that cause ecological devastation and compromised health are replaced with meaningful work in our own interests; restoring our labor and our resources to the web of life."

Friday, June 18, 2010

The 20 minute neighborhood and other ideas for Fredericton

Groups as different as Mother Nature Network, Popular Science, and Grist have ranked Portland Oregon as the most sustainable city in the US (though Portland was ranked 3rd by the Natural Resources Defense Council).

In a recent interview, Portland mayor Sam Adams talked about his new initiative -- the 20 minute neighborhood.
We're also working to make every section of Portland a complete 20-minute neighborhood to strengthen our local economy. Two-thirds of all trips in Portland and in most American cities are not about getting to and from work. So if I can offer quality, affordable goods and services, eliminate food deserts, have neighborhoods with schools and parks and amenities--if I can create these 20-minute complete neighborhoods all over Portland--it strengthens our local economy. We drive 20% less than cities of comparable size, and because we don't manufacture cars, produce oil, or have car insurance companies, every dollar that we don't spend elsewhere, will stay in Portland's economy. There's about $850 million that stays in Portlanders's pockets because we drive less. With a 20-minute neighborhood, also reduce congestion and meet our climate action plan goals.

It's interesting the way the idea is framed in terms of the local economy. I recently returned from a visit to the other Portland (Maine) where I was really impressed with the strength and sophistication of their 'Buy Local' initiative. They aim to get everyone to shift 10% of their spending to local stores pointing out that "For every $100 spent at a locally owned business, $45 stays in the local economy, creating jobs and expanding the city's tax base. For every $100 spent at a national chain or franchise store, only $14 remains in the community." Part of their success comes from the merger of local farms and the restaurant industry. Bon Appetit labeled Portland "America's Foodiest Small Town." They use some interesting electronic technology to help inform locals and tourists about food related matters. And the food is simply amazing. While I like our local Greek food at Dimitri's, it pales in comparison to what you get at Emilitsa. Probably the best meal of my life and definitely the best baklava!

Perhaps a better comparison for Fredericton is Bellingham, Washington (a university city of 67,000 people where I did my BA) and ranked Number 1 by the NRDC as the Greenest Small City in the US. They have an active Transition Towns movement.

Wednesday, February 3, 2010

Taking urban gardening to new heights



Artists rendering of the proposed renovation of the Federal Building in Portland, Oregon. The building will have “vegetated fins” that grow more than 200 feet high on the western side of the building, a vertical garden that changes with the seasons -- leafing out and providing shade in the spring and summer while loosing the leaves and allowing light in the winter. The end result? An expected savings of $280,000 per year in energy costs.

The project, however, is mired in controversy, partly because of design issues -- a process for irrigating the fins hasn't yet been incorporated into the design -- but mainly because of the cost. The government views it as a demonstration project; aimed at testing the actual benefits of a conceptual idea. That's a legitimate approach, but there then needs to be some way of assessing the efficiency of the design and, if the design turns out to be effective, to diffuse the concept within the design community. This is not unlike the problems with the LEED standards for green buildings in general, where LEED certification is based on the design of the building rather than its operation and, once built, the buildings turn out not to be as green as expected.

Wednesday, November 25, 2009

New Book: William Catton Returns with "Bottleneck"


George Mobus, Assoc. Prof. of Computing Software Systems at the Univ. of Washington Tacoma does a lengthy review of William R. Catton's Bottleneck: Humanity's Impending Impasse. The book is posed as a sequel to Catton's 1983 book, Overshoot, which has become a classic of literature in environmental sociology. The review is posted at The Oil Drum.
Warning: this book does not have a happy ending.

"In the sequel, Bottleneck: Humanity's Impending Impasse, Xlibris Corporation, he drops the part about we can evade the worst. The subtitle says it all. Now he concludes that it is already too late to mend our ways and somehow avoid the collapse of civilization. Indeed the main title refers to an impending collapse of the human population. An ecological bottleneck (also called a population bottleneck) is where radical changes in the environment of a species causes a die-off of all but the most hardy of the population; hardy, that is, in terms of the selection pressures arising from the change. Of course there may be no sufficiently hardy individuals left or the ones that manage to survive cannot reproduce sufficiently to produce a new population. In that case the species goes extinct.

Catton's arguments for why this is the most likely outcome for humanity boil down to something I have written about in my blog for several years now. It is the rate of change that matters as much as the degree or magnitude of change when it comes to shocking a population. If we look at the rate of climate change due to anthropogenic forcing, or the rate at which our fossil fuel energy sources are depleting, or the rate of aquifer depletion, or the rate of population increase, or the rate of consumption increase per captia in the developed and developing worlds, or... You get the picture. We are changing the world in ways unfavorable to human survivability more rapidly than we can either adapt or mitigate. And we have already passed the point of no return."

Saturday, November 21, 2009

Stewart Brand on 4 Environmental Heresies

Stewart Brand, the author of the Whole Earth Catalog, was one of the leaders of the 60's environmental movement. He has recently been rethinking his positions on cities, nuclear power, genetic modification and geo-engineering. His ideas (Cities are Green! Nukes are Green! Gene modification is Green! Geoengineering is Probably Necessary!) have recently been published in WHOLE EARTH DISCIPLINE: An Ecopragmatist Manifesto a review of which is available here.

For the video inclined, he covers much the same ground in this TED talk.


Friday, October 30, 2009

Cdn Bill Rees on Urban Ecology and "Smart Decline"

Bill Rees, creator of the "ecological footprint," gave a lecture at the 2009 Gaining Ground Summit in Vancouver on the evolution of cities and "smart decline," or "planning down", i.e. planning for a descent in consumption, not just in fuel, but all consumer goods and natural resources. He opens with one of the most original and revelatory statements I've heard on the evolution of cities.

Smart Decline in CD Quality

You should definitely put "Radio Ecoshock" from Vancouver on your short list of "must listen to" podcasts. It's the only site I've found that regularly features interviews and presentations of actual climate scientists from around the world on climate change issues. If you want the latest on climate science, check out Alex Smith's podcast.