I'm sure the majority (but not all) of my IPCC colleagues cringe when I say this, but I see neither the developing catastrophe nor the smoking gun proving that human activity is to blame for most of the warming we see. Rather, I see a reliance on climate models (useful but never "proof") and the coincidence that changes in carbon dioxide and global temperatures have loose similarity over time.
There are some of us who remain so humbled by the task of measuring and understanding the extraordinarily complex climate system that we are skeptical of our ability to know what it is doing and why. As we build climate data sets from scratch and look into the guts of the climate system, however, we don't find the alarmist theory matching observations. (The National Oceanic and Atmospheric Administration satellite data we analyze at the University of Alabama in Huntsville does show modest warming -- around 2.5 degrees Fahrenheit per century, if current warming trends of 0.25 degrees per decade continue.)
It is my turn to cringe when I hear overstated-confidence from those who describe the projected evolution of global weather patterns over the next 100 years, especially when I consider how difficult it is to accurately predict that system's behavior over the next five days.
Without a doubt, atmospheric carbon dioxide is increasing due primarily to carbon-based energy production (with its undisputed benefits to humanity) and many people ardently believe we must "do something" about its alleged consequence, global warming. This might seem like a legitimate concern given the potential disasters that are announced almost daily, so I've looked at a couple of ways in which humans might reduce CO2 emissions and their impact on temperatures.
California and some Northeastern states have decided to force their residents to buy cars that average 43 miles-per-gallon within the next decade. Even if you applied this law to the entire world, the net effect would reduce projected warming by about 0.05 degrees Fahrenheit by 2100, an amount so minuscule as to be undetectable. Global temperatures vary more than that from day to day.
Suppose you are very serious about making a dent in carbon emissions and could replace about 10% of the world's energy sources with non-CO2-emitting nuclear power by 2020 -- roughly equivalent to halving U.S. emissions. Based on IPCC-like projections, the required 1,000 new nuclear power plants would slow the warming by about 0.2 ?176 degrees Fahrenheit per century. It's a dent.
But what is the economic and human price, and what is it worth given the scientific uncertainty?
My experience as a missionary teacher in Africa opened my eyes to this simple fact: Without access to energy, life is brutal and short. The uncertain impacts of global warming far in the future must be weighed against disasters at our doorsteps today. Bjorn Lomborg's Copenhagen Consensus 2004, a cost-benefit analysis of health issues by leading economists (including three Nobelists), calculated that spending on health issues such as micronutrients for children, HIV/AIDS and water purification has benefits 50 to 200 times those of attempting to marginally limit "global warming."
Given the scientific uncertainty and our relative impotence regarding climate change, the moral imperative here seems clear to me.
Adéu a Nihil Obstat | Hola a The Catalan AnalystDesprés de 13 anys d'escriure en aquest bloc pràcticament sense interrumpció, avui el dono per clausurat. Això no vol dir que m'hagi jubilat de la xarxa, sinó que he passat el relleu a un altra bloc que segueix la mateixa línia del Nihil Obstat. Es tracta del bloc The Catalan Analyst i del compte de Twitter del mateix nom: @CatalanAnalyst Us recomano que els seguiu.
Moltes gràcies a tots per haver-me seguit amb tanta fidelitat durant tots aquests anys.
divendres, 2 de novembre de 2007
Renúncia al Nobel per no fer el joc a Al Gore
Via Barcepundit m’assabento que John R. Christy, membre de l’IPCC de l’ONU, ha renunciat a la part que li correspon del premi Nobel de la Pau atorgat per meitats a Al Gore i a l’IPCC. Christy ha pres aquesta decissió fart de la poca rigurositat científica dels predicadors de l’apocalipsi climàtica. Chirsty, que se suma a la posició escèptica de Bjorn Lomborg, ha fet aquest anunci en un article publicat ahir al Wall Street Journal.
Publicado por NO a les 11:45 a. m.