The Climate Change Science Program web site has the newly-released Scientific Assessment of the Effects of Global Change on the United States frontpage, along with a Revised Research Plan for the CCSP.
Recently Pielke, Wigley and Green discussed the implications of autonomous energy efficiency improvements (AEEI) in IPCC scenarios, provoking many replies. Some found the hubbub around the issue surprising, because the assumptions concerned were well known, at least to modelers. I was among the surprised, but sometimes the obvious needs to be restated loud and clear. I believe that there are several bigger elephants in the room that deserve such treatment. AEEI is important, as are other hotly debated SRES choices like PPP vs. MEX, but at the end of the day, these are just parameter choices. In complex systems parameter uncertainty generally plays second fiddle to structural uncertainty. Integrated assessment models (IAMs) as a group frequently employ similar methods, e.g., dynamic general equilibrium, and leave crucial structural assumptions untested. I find it strange that the hottest debates surround biogeophysical models, which are actually much better grounded in physical principles, when socio-economic modeling is so uncertain.
Will this – like the satellite temperature trend – be another case of model-data discrepancies resolved in favor of the models?
Update: Prometheus wonders if this changes IPCC conclusions.
One observation from my recent experience with climate policy in California is that businesses – even energy intensive ones – are uncertain how to engage in the public debate. Climate policy is a messy space with many competing options, and it’s hard to know what to wish for. With that in mind, here’s a quick survey of what various business groups are saying.
Every year or two the “gas out” email arrives in my inbox. This year, it’s May 15th when “all internet users are to not go to a gas station in protest of high gas prices.” Wait – am I supposed to avoid gas stations, or protesting at gas stations? I’m amazed at the durability of this internet chain letter, which now claims a ten-year history: “In April 1997, there was a “gas out” conducted nationwide in protest of gas prices. Gasoline prices dropped 30 cents a gallon overnight.” A Monty Python tune from The Meaning of Life jumps to mind:
So remember when you’re feeling very small and insecure
How amazingly unlikely is your birth
And pray that there’s intelligent life somewhere up in space
Because there’s bugger all down here on earth.
The NYT reports that a switch to efficient cars is underway, as evidenced by, among other things, an increase in market share for small cars from an eighth of the market at the height of SUV-mania to a fifth today, together with a sharp drop in large truck and SUV sales.
If sustained, such a shift would signal a very significant sensitivity of vehicle efficiency purchasing habits to fuel prices – perhaps much larger than the low short run price elasticity of gasoline demand. However, I think there is reason to interpret these recent events cautiously, lest they prove a little less astonishing in the long run. Continue reading “The Switch to Small Cars – Not So Fast”
DeSmogBlog documents scientists’ outrage at inclusion on Dennis Avery’s list of 500 Scientists with Documented Doubts of Man-Made Global Warming Scares. Amusingly, the scientists concerned, a few of whom are deceased, are listed as “Co-Authors”. I’m going to put this new “open coauthoring” concept to work – I’m already working on abstracts. First, I think I’ll lower my Erdős number – Paul, dude, you can be my second. Next, I think I’ll team up with Einstein and Bohr to finish up quantum gravity.
The NYT reports that Hillary Clinton and John McCain have lined up to suspend federal excise taxes on fuel:
Senator Hillary Rodham Clinton lined up with Senator John McCain, the presumptive Republican nominee for president, in endorsing a plan to suspend the federal excise tax on gasoline, 18.4 cents a gallon, for the summer travel season. But Senator Barack Obama, Mrs. Clinton’s Democratic rival, spoke out firmly against the proposal, saying it would save consumers little and do nothing to curtail oil consumption and imports.
Mrs. Clinton would replace that money with the new tax on oil company profits, an idea that has been kicking around Congress for several years but has not been enacted into law. Mr. McCain would divert tax revenue from other sources to make the highway trust fund whole.
On April 22, EIA data put WTI crude at $119/bbl, which is $2.83/gal before accounting for refinery losses. Spot gasoline was at $2.90 to $3.14 (depending on geography and type), which is about what you’d expect with total taxes near $0.50 and retail gasoline at $3.55/gal. With refinery yields typically at something like 85%, you’d actually expect spot gasoline to be at about $3.30, so other, more-expensive products (diesel, jet fuel, heating oil) or cheaper feedstocks must be making up the difference. The price breaks down roughly as follows:
Today ScienceDaily brought the troubling news that, “There was a steady increase in mortality inequality across the US counties between 1983 and 1999, resulting from stagnation or increase in mortality among the worst-off segment of the population.” The full article is PLoS Medicine Vol. 5, No. 4, e66 doi:10.1371/journal.pmed.0050066. ScienceDaily quotes the authors,
Ezzati said, “The finding that 4% of the male population and 19% of the female population experienced either decline or stagnation in mortality is a major public health concern.” Christopher Murray, Director of the Institute for Health Metrics and Evaluation at the University of Washington and co-author of the study, added that “life expectancy decline is something that has traditionally been considered a sign that the health and social systems have failed, as has been the case in parts of Africa and Eastern Europe. The fact that is happening to a large number of Americans should be a sign that the U.S. health system needs serious rethinking.”
I question whether it’s just the health system that requires rethinking. Health is part of a complex system of income and wealth, education, and lifestyle choices:
A pair of papers in Science this week refines the understanding of the acceleration of glacier flow from lubrication by meltwater. The bottom line:
Now a two-pronged study–both broader and more focused than the one that sounded the alarm–has confirmed that meltwater reaches the ice sheet’s base and does indeed speed the ice’s seaward flow. The good news is that the process is more leisurely than many climate scientists had feared. “Is it, ‘Run for the hills, the ice sheet is falling in the ocean’?” asks glaciologist Richard Alley of Pennsylvania State University in State College. “No. It matters, but it’s not huge.” The finding should ease concerns that Greenland ice could raise sea level a disastrous meter or more by the end of the century. Experts remain concerned, however, because meltwater doesn’t explain why Greenland’s rivers of ice have recently surged forward.
A remarkable excerpt:
The meltwater monitoring caught a 4-kilometer-long, 8-meter-deep lake disappearing into the ice in an hour and a half. As theorists had supposed, once the lake water was deep enough, its weight began to wedge open existing cracks, which only increased the weight of overlying water on the crack tip and accelerated cracking downward. Once the main crack reached the bottom of the ice, heat from churning water flow melted out parts of the fracture, and drainage took off. The lake disappeared in about 1.4 hours at an average rate of 8700 cubic meters per second, exceeding the average flow over Niagara Falls. That’s almost four Olympic pools a second.
Check it out (subscription required).