Why positive feedback doesn’t necessarily lead to runaway warming – Positive feedback happens when the response to some change amplifies that change. For example: The Earth heats up, and some of the sea ice near the poles melts. Now bare water is exposed to the sun’s rays, and absorbs more light than did the previous ice cover; so the planet heats up a little more. In both of these cases, the “effect” reinforces the “cause”, which will increase the “effect”, which will reinforce the “cause”… So won’t this spin out of control? The answer is, No, it will not, because each subsequent stage of reinforcement & increase will be weaker and weaker. The feedback cycles will go on and on, but there will be a diminishing of returns, so that after just a few cycles, it won’t matter anymore.
Himalayan Glaciers: Wrong Date, Right Message – Is the AR4 terribly flawed? It is important to note that this is one error in a roughly 3000 page technical document, an error percentage similar to the Encyclopedia Britannica. The 2035 claim was not included in the Technical Summary, the Summary for Policymakers, or the Synthesis Report. Does this error show the IPCC has an ‘alarmist’ bias – a tendency to exaggerate the negative impacts of climate change? In fact, there are far more documented instances of the AR4 being too conservative, rather than too alarmist, on emissions scenarios, sea level rise, and Arctic sea-ice melt. Many of the Himalayan Glaciers are retreating at an accelerating rate (Ren 2006) and roughly 500 million people depend on the melt water from these glaciers (Kehrwald 2008).
A history of international climate change policy – An overview of the history of international climate policy over the last 30 years, divided into five periods. The article shows (1) the increasing complexity of the definition of the climate change issue from an environmental to a development issue; (2) the inability of the developed countries to reduce their own emissions and raise funds commensurate with the nature of the problem and their initial commitments; (3) the increasing engagement of different social actors in the discussion and, in particular, the gradual use of market mechanisms in the regime; (4) the increasing search for alternative solutions within the formal negotiations—such as the identification of nationally appropriate mitigation actions for the developing world, reducing emissions from deforestation and forest degradation, and the use of geo-engineering solutions; and (5) the search for solutions outside the regime—the mobilization of sub-national policies on climate change, litigation, and markets on biofuels.
Coffee threatened by beetles in a warming world (!) – The Arabica coffee grown in Ethiopia and Latin America is an especially climate-sensitive crop. It requires just the right amount of rain and an average annual temperature between 64 degrees Fahrenheit and 70 degrees Fahrenheit to prosper. As temperatures rise — Ethiopia’s average low temperature has increased by about .66 degrees F every decade since 1951, according to the country’s National Meteorological Agency — and rains become more variable, Ethiopian coffee farmers have suffered increasingly poor yields. Last year was especially bad, with exports dropping by 33 percent. Some have moved their coffee trees to higher elevations, while others have been forced to switch to livestock and more heat-tolerant crops, such as enset, a starchy root vegetable similar to the plantain. Now, there is evidence that a warming climate may be linked to one of the major threats facing the coffee industry in Ethiopia and elsewhere…
And yet it works. Adam Corner on ‘ClimateGate’, transparency & peer-review. – “Open access is based on the premise that there are those outside the inner circle of peer reviewers who are competent enough to provide a second opinion on the science. This is indisputably true. But while talk of throwing open the lab doors might be rhetorically satisfying, it would provide only an illusion of democracy. Certainly there are non-academics competent enough with statistics to find errors in a piece of published science. Correcting errors in science would be a valuable service for an auditor to offer. But if several auditors reached conflicting conclusions, then somehow a judgement would have to be made about their respective competence. And who should make that judgement? Presumably a group of suitably qualified, honest individuals with a proven track record in a relevant discipline – in other words, peer review.”
Climate email inquiry: bringing democracy to science | Richard Horton – “Scientists need to do more to emphasise their uncertainties, not recoil from them. Uncertainty may be uncomfortable, but its admission builds trust. It demonstrates integrity. One of science’s great strengths is its quantification of doubt. Fourth, scientists need to take peer review off its pedestal. As an editor, I know that rigorous peer review is indispensable. But I also know that it is widely misunderstood. Peer review is not the absolute or final arbiter of scientific quality. It does not test the validity of a piece of research. It does not guarantee truth. Peer review can improve the quality of a research paper – it tells you something about the acceptability of new findings among fellow scientists – but the prevailing myths need to be debunked. We need a more realistic understanding about what peer review can do and what it can’t. If we treat peer review as a sacred academic cow, we will continue to let the public down again and again.”
Economics Behaving Badly – A great NYT article on behavioural economics & its failings, important for climate policy.
Climate change is leaving us with extra space junk – Even the space junk is trying to tell us we’re changing the climate. One more independent line of evidence to add to the pile, how many do we need?!
Black Carbon’s Grey Areas – A brilliant, must-read article on black carbon. Who would have thought it has such broad geopolitical implications? Worth the effort. It’s conclusions: 1. Stop throwing cook-stoves at the problem. 2. Target diesel. 3. Be very careful about comparing black carbon with carbon dioxide.
Arctic climate may be more sensitive to warming than thought – “Our findings indicate that CO2 levels of approximately 400 parts per million are sufficient to produce mean annual temperatures in the High Arctic of approximately 0 degrees Celsius (32 degrees F) [19 degrees Celsius warmer than today!],” Ballantyne said. “As temperatures approach 0 degrees Celsius, it becomes exceedingly difficult to maintain permanent sea and glacial ice in the Arctic. Thus current levels of CO2 in the atmosphere of approximately 390 parts per million may be approaching a tipping point for irreversible ice-free conditions in the Arctic.”
Troubling ice melt in East Antarctica – it’s losing mass, which is not good. – “It’s too early to know what the ice loss in East Antarctica really means, says Isabella Velicogna, a remote-sensing specialist at NASA’s Jet Propulsion Laboratory in Pasadena, California. “What is important is to see what’s generating the mass loss,” she says. Reductions in snowfall, for example, might reflect short-term weather cycles that could reverse at any time. But thinning caused by accelerating glaciers—as seen in West Antarctica—would warrant concern.”
Peru inventor ‘whitewashes’ peaks to slow glacier melt – In a remote corner of the Peruvian Andes, men in paint-daubed boilersuits diligently coat a mountain summit with whitewash in an experimental bid to recuperate the country’s melting glaciers. Peru’s Environment Minister Antonio Brack has said the World Bank’s 200,000 dollars in funding would be better spent on other “projects which would have more impact in mitigating climate change.” “It’s nonsense”, he commented bluntly last year.
Leakegate: A retraction – “It is an open question as to what impact these retractions and apologies have, but just as with technical comments on nonsense articles appearing a year after the damage was done, setting the record straight is a important for those people who will be looking at this at a later date, and gives some hope that the media can be held (a little) accountable for what they publish.”
And finally, on a slight tangent:
Ben Goldacre: Yeah well you can prove anything with science – “When presented with unwelcome scientific evidence, it seems, in a desperate bid to retain some consistency in their world view, people would rather conclude that science in general is broken. This is an interesting finding. But I’m not sure it makes me very happy.”
Some excitable climate deniers just don’t understand what science is – “The essential problem is that the public — the media very much included — generally doesn’t understand science. Most of us think science is a list of absolutely certain facts that are not open for debate. If a theory is on the list, it’s not debatable and we should act on it; if it’s not, it is debatable and we should not act on it. As a result, scientists often find it hard to communicate scientific conclusions to the public. If they speak scientifically, they have to acknowledge that even though most scientists have come to a conclusion they are reasonably confident is true, there is continued uncertainty and debate. But if they do that, people will think the conclusion isn’t yet a scientific fact — and we shouldn’t act on it.”
Climate Change: A Threat to Global Security. US & UK Defense agree. – “I am struck by how similar UK and U.S. thinking is on the national security implications of climate change. Our defense departments agree that the impact of climate change is likely to be most severe in areas where it coincides with other stresses, such as poverty, demographic growth, and resource shortages: areas through which much of the world’s trade already passes.”
A Superstorm for Global Warming Research – a terrible terrible piece from Der Spiegel, who are usually pretty good at science reporting. Two of the authors have previously written some very misleading and inaccurate articles on climate change. Watch this space for updates…
Visualizing Arctic Sea Ice Extent Trends – “If you find yourself asking “what about … or what happens when…”, it’s probably time to make another chart that directly addresses your new “compared to what” question. Don’t expect one chart to answer multiple questions.”
Arctic ice recovers from the great melt – Wow, a semi-decent piece by Jonathan Leake! Apart from wrongly attributing the recent ‘spurt’ in ice growth to the Arctic Oscillation (it was more likely just a response to changes in regional atmospheric circulation) it’s a measured and almost insightful piece… is something weighing on his mind perhaps?
SealevelGate – Real Climate cover the true IPCC sea-level scandal. Must read.
Climate of fear, Nature editorial (free access) – “The integrity of climate research has taken a very public battering in recent months. Scientists must now emphasize the science, while acknowledging that they are in a street fight.”
Short must read: Climate Change and the Media – “What’s truly infuriating about this episode of journalistic malpractice is that, once again, it illustrates the reasons why the East Anglia scientists adopted an adversarial attitude towards information management with regard to outsiders and the media. They were afraid that any data they allowed to be characterised by non-climate scientists would be vulnerable to propagandistic distortion. And they were right.”
A Historian Looks ‘Back’ at the Climate Fight – Dot Earth Blog – “But this was the first time the media reported that an entire community of scientists had been accused of actual dishonesty. Such claims, if directed for example at a politician on a matter of minor importance, would normally require serious investigation.”
