The environment – Page 108 – a sibilant intake of breath

Climate sensitivity roulette

As discussed several times previously, two of the key uncertainties relating to climate change is (a) how much temperature would increase in response to any particular change in the atmospheric concentration of greenhouse gasses and (b) what humanity will actually emit between now and the achievement of global carbon neutrality. One way to express those uncertainties colourfully is with the Roulette wheels the MIT Joint Program on the Science and Policy of Global Change has created.

The wheels are based on results from the MIT Integrated Global Systems Model and have shaded areas proportional in size to different possible levels of temperature increase. The projections were recently updated, and the new ones contain significantly higher estimates of the risks of high levels of warming:

The new projections, published this month in the American Meteorological Society’s Journal of Climate, indicate a median probability of surface warming of 5.2 degrees Celsius by 2100, with a 90% probability range of 3.5 to 7.4 degrees. This can be compared to a median projected increase in the 2003 study of just 2.4 degrees. The difference is caused by several factors rather than any single big change. Among these are improved economic modeling and newer economic data showing less chance of low emissions than had been projected in the earlier scenarios. Other changes include accounting for the past masking of underlying warming by the cooling induced by 20th century volcanoes, and for emissions of soot, which can add to the warming effect. In addition, measurements of deep ocean temperature rises, which enable estimates of how fast heat and carbon dioxide are removed from the atmosphere and transferred to the ocean depths, imply lower transfer rates than previously estimated.

Full article

The ‘policy’ wheel assumes aggressive mitigation action, while the ‘no policy’ wheel assumes a business-as-usual course. It is notable that the chances of keeping warming below 2°C are infinitesimal, on that wheel. Even with aggressive action, our changes of keeping below 2°C of increase are looking increasingly distant, with effects that may be severe for both human and natural systems.

In addition to being a good visual image, I like the conceptual linkage between climate change and gambling. We are certainly taking a chance, whatever we do, but science can help us to assess the odds we face and make choices that reduce the risks of unacceptable outcomes.

Coal cancellations in the US

The Economist has been bold enough to suggest that ‘the writing is on the wall’ for coal-fired power plants in the United States, unless they can be converted to run on biomass or incorporated into other ‘green’ compromises. While there have apparently been 97 coal plants cancelled since 2001 (and nine so far this year), those that are operating now are long lived; their contribution to US emissions will barely fall between now and 2030. Unusually, the article makes no mention of carbon capture and storage (CCS) technology, which many supporters of fossil-fuel based power hope will soon emerge as a cheap, safe, and effective mechanism for preventing greenhouse gas emissions. The omission is actually a welcome one, given how tempted industry groups, governments, and commenters in general have been to see CCS as a simple silver-bullet mechanism for maintaining the status quo.

Worldwide, there must be an ever-increasing determination to prevent the construction of new coal capacity, except where it incorporates safe and effective CCS technology (if that proves possible). Meeting climate change mitigation targets (including avoiding a temperature increase of more than 2°C above pre-industrial levels) probably also means a fair bit of existing coal capacity will need to be converted to biomass or brought offline before the end of its economical lifetime. That will provoke the fierce opposition of those who have invested in such projects, though that may be a necessary signal to the market at large that coal-fired power is no longer acceptable – the carbon in the world’s coal beds needs to remain there, rather than being added to an atmospheric stock that is already dangerously high.

States like Canada and the US should be working to rebuild the basis of their energy system on the basis of non-emitting and renewable options. In so doing, they will establish the prerequisites for their own prosperity in the future, as well as help develop the technologies and approaches that will make the same transition possible in rapidly growing developing states.

Cloud cover and climate change

According to research published back in April, the biggest climate changes in the 21st century may occur more due to changes in high altitude cloud cover, in response to increased temperatures from rising greenhouse gas concentrations, rather than due to the initial temperature increases themselves: Global warming due to increasing absorbed solar radiation, published in Geophysical Research Letters.

Reduced cloud cover would reduce the amount of sunlight that gets reflected back into space, rather than striking the surface of the Earth. As such, it would produce further warming. Based on evaluation of simulations used in preparing the Fourth Assessment Report of the IPCC, this effect may be of greater magnitude than the initial warming due to increased absorption of outgoing long-wave radiation by greenhouse gasses.

While the result certainly cannot be considered definitive now, it underscores the importance of improving climate models and incorporating the key feedback effects into them. Only when that has been done can more precise estimates of the climatic sensitivity of the planet be produced, as well as more accurate regional projections.

The AECL and new nuclear plants in Ontario

It seems that the province of Ontario is leaning towards having Atomic Energy of Canada Limited (AECL) build their new nuclear reactors, provided the federal government provides some additional support. The recent history of the company isn’t very impressive, given their failure to get two comparatively simple isotope reactors to work, and giving the contract to a Canadian company makes it even more likely that Canadian taxpayers and ratepayers will end up subsidizing them.

Perhaps it would be wiser to give the contract to a French, American, or Japanese firm, and let their citizens help pay for our gigawatts. It seems plausible that using a design that is being implemented elsewhere will have price benefits: both in terms of economies of scale and in terms of learning from the experience of those who began building them earlier. AECL’s Advanced CANDU reactor has not yet been fully designed, and probably never will be unless it wins the competition in Ontario, besting France’s AREVA and Westinghouse, from the US.

New research on the meridional overturning circulation

Recent research undertaken by the Woods Hole Oceanographic Institution and Duke University suggests that ocean currents work differently from how they were previously considered to, with implications for climate change. Using a combination of two years worth of observations from underwater sensors and computer models, they determined that “much of the southward flow of cold water from the Labrador Sea moves not along the deep western boundary current, but along a previously unknown path in the interior of the North Atlantic.” If the results of this study are accurate, it could mean that previous attempts to model the climate system incorporated inappropriate behaviour for this current. As a result, they could have generated less accurate projections of how warming due to greenhouse gas concentrations will affect different parts of the climate system.

More information about the study is available in Nature: Interior pathways of the North Atlantic meridional overturning circulation. For those lacking time or access to Nature, here is the abstract:

To understand how our global climate will change in response to natural and anthropogenic forcing, it is essential to determine how quickly and by what pathways climate change signals are transported throughout the global ocean, a vast reservoir for heat and carbon dioxide. Labrador Sea Water (LSW), formed by open ocean convection in the subpolar North Atlantic, is a particularly sensitive indicator of climate change on interannual to decadal timescales. Hydrographic observations made anywhere along the western boundary of the North Atlantic reveal a core of LSW at intermediate depths advected southward within the Deep Western Boundary Current (DWBC). These observations have led to the widely held view that the DWBC is the dominant pathway for the export of LSW from its formation site in the northern North Atlantic towards the Equator. Here we show that most of the recently ventilated LSW entering the subtropics follows interior, not DWBC, pathways. The interior pathways are revealed by trajectories of subsurface RAFOS floats released during the period 2003–2005 that recorded once-daily temperature, pressure and acoustically determined position for two years, and by model-simulated ‘e-floats’ released in the subpolar DWBC. The evidence points to a few specific locations around the Grand Banks where LSW is most often injected into the interior. These results have implications for deep ocean ventilation and suggest that the interior subtropical gyre should not be ignored when considering the Atlantic meridional overturning circulation.

Improving our understanding of ocean currents should help to improve the accuracy of predictions from general circulation climate change models, and may be helpful in producing regionally specific projections of climate change impacts.

Changing Images of Man

First published in 1974, and available for free online, Changing Images of Man is a kind of philosophical reflection on science and how human beings understand themselves. While it does touch on some interesting ideas, the degree to which it is fundamentally lacking in rigour or discipline means that it is also choked with nonsense, impenetrable jargon, and pointless speculation. In short, it does not have the feel of a text whose ideas have been borne out by subsequent history. Rather, it is more like a monument to a kind of faddishness that has long since become dated, though elements endure in the more superstitious aspects of contemporary culture.

Much of the book concerns environmental issues: specifically, how human civilization can cease to be such a destructive force, and how ecology is affecting science in general. Neither discussion is very satisfying. The former discussion focuses on a kind of caricatured extension of the Beatles going to India to lean yoga and discover themselves. While significant transformations in human behaviours and self-understanding may well be necessary to generate a sustainable society, the perspective on those changes offered in this work doesn’t seem either plausible or compelling to me. The latter discussion exaggerates the degree to which the study of complex dynamic systems challenges the practice of science: while they are certainly more challenging to study scientifically than systems that are more easily broken down and understood in terms of constituents, science is nonetheless proving increasingly capable of dealing with complex systems like climate and ecosystems, and is doing so without the kind of radical extension and modification endorsed by this book.

Much of the book is no more comprehensible than a random string of pompous-sounding words strung together in a grammatical way. It seems telling that the chapter on ‘feasibility’ is the least accessible and comprehensible of the lot. The report perceives a crisis in science that I don’t think existed at the time it was written, and I do not think has emerged since. Complex phenomenon are being grappled with using enhanced versions of conventional techniques, while UFOs and psychic phenomena have been effectively rejected as quackery, due to the absence of any good evidence for their existence. Basically, Changing Images of Man is an exhortation to abandon rigorous thought in favour of a kind of wooly inclusiveness, exceedingly open to ideas that are too vague to really engage with. The book has a naive counterculture tone, overly willing to reject what is old and unthinkingly embrace novel concepts that register with a 1960s/1970s mindset. While the questions it considers are generally good and important ones, the answers provided are vague, preachy, and largely useless.

Climate deniers deciding science funding in Canada

In yet another demonstration of the ongoing tensions between conservative political parties and science, Prime Minister Stephen Harper has appointed a couple of climate change deniers to federal science funding bodies. One has claimed that “the climate-change issue is somewhat sensational and definitely exaggerated.” The appointments seem likely to worsen the quality of scientific work being done in Canada, putting us further behind the rest of the developed world, when it comes to comprehending and appreciating the characteristics of the world in which we live, and in which important political choices must be made.

This is reminiscent of the appointment of a man seriously invested in the oil sands to the ‘Clean Energy Dialogue’ ongoing with the US. The Conservatives claim that they accept the science of climate change, but they cannot really take it to heart because of the degree to which it fundamentally conflicts with a laissez faire approach to economic regulation.

All we can hope for is for climate change denial to eventually become so patently ridiculous to the electorate that parties that continue to dabble in it seem to be arguing the equivalent of the Earth being flat and orbited by the sun. That may be the only time at which conservative parties have the impetus they need to reform their ideas to be compatible with what we now understand to be the state of the world.

The B.C. election and carbon pricing

From a climatic perspective, it seems that there are two reasons to be glad about the recent electoral victory of the Liberal Party in British Columbia:

Firstly, it shows that carbon pricing (and carbon taxes, specifically) need not mean death at the ballot box. While it is still far too weak, the B.C. carbon tax is at least a progressive example for North America. Some have concluded that it is actually the most effective climate policy in effect on the continent at this time.
Secondly, it shows that an unprincipled stand against carbon pricing can actually cost a party support. This is an essential development, if we are to deal with climate change. Succeeding will depend on carbon mitigation policies enduring and strengthening for many decades. As such, we need to reach the point where the electorate rejects those who would scrap them for non-environmental reasons.

While there are plenty of reasons to dislike both major political parties in B.C., at least this election didn’t prove to be yet another setback for effective climate policy in Canada.

Here’s hoping the US Congress is able to pass a cap-and-trade scheme before the Copenhagen meeting, and that Canada will finally roll out regulations on greenhouse gas emissions nationally.

Australia’s coal and China

All regular readers of this site are familiar with Canada’s energy dilemma, as far as the oil sands, the United States, and climate change are concerned. The US has a huge appetite for oil, and is increasingly anxious about getting it from the Middle East. From a short-term perspective, this positions Canada’s unconventional oil very nicely. Of course, when you think long-term and realize the importance of climate stability, you become a lot more likely to think we would be better off leaving the stuff in the ground.

A similar dynamic seems to exist when it comes to coal, Australia, and China. In March 2009, China imported 1,716,802 tons of Australian coal. All told, it imported 211% more coal between January and March as in the previous year. Like Canada, Australia has extremely high per-capita emissions, a poor record on greenhouse gas mitigation, and a lot of export-oriented resource extraction industry. Also like Canada, it may well be the case that long-term climatic stability requires leaving most of that coal underground.

As such, it is disappointing that Australia has delayed plans to institute carbon pricing. When it comes to the negotiations at Copenhagen in December, dealing with the complexities of energy imports and exports will certainly be among the trickier issues that need to be sorted out in negotiations. While the climatic requirements are clear (sharply reduce global emissions), the economic and moral ones are trickier. After all, a fair bit of the coal China is burning is being used to make products for people in other states. Who, then, bears the moral responsibility for the emissions associated with extracting, shipping, and burning the coal? What sort of legal regime can be established to effectively incentivize decarbonization throughout such complex international production chains?

Ignatieff and climate change

In sharp contrast to Stephane Dion, who put environmental issues front and centre, the new federal Liberal leader is much more restrained when describing his position on climate change policy. In addition, Michael Ignatieff seems to be going out of his way to show support for ‘the west’ and, by extension, the Athabasca oil sands.

It is possible that this is an electoral ploy, designed to isolate him from the perceived failure of Dion. It is also possible that Ignatieff has the intention of taking significant action on climate change, but has deemed it tactically appropriate to keep it quiet. Finally, it is possible that he thinks such action is either not necessary or not worth the political price he thinks it would involve. For those concerned about climate change, the last is a troubling possibility. If Canada is going to hit the targets established by the current government – much less, stronger targets as advocated by many scientists and NGOs – much bolder governmental action will be necessary, and higher costs will necessarily fall upon carbon-intensive industries.

With the eternal bubble of speculation about elections that accompanies a minority government, what do people think the real Ignatieff agenda on climate change would be, if he is able to bring the Liberals back into government? Would it likely be more or less aggressive if they did so with a majority, as opposed to simply replacing the Conservatives in the perilous minority spot?