Richard A. Muller shares the findings of the Berkeley Earth Surface Temperature Project in an NYTimes Op-Ed. Dr. Muller was a vocal critic of the IPCC and earlier climate change research, but the project finds that human carbon emissions are the entire cause of observed change in the climate over the past 250 years! (The IPCC only stated the link was for the past 50 years.)
…studied issues raised by skeptics: biases from urban heating (we duplicated our results using rural data alone), from data selection (prior groups selected fewer than 20 percent of the available temperature stations; we used virtually 100 percent), from poor station quality (we separately analyzed good stations and poor ones) and from human intervention and data adjustment (our work is completely automated and hands-off)…
How definite is the attribution to humans? The carbon dioxide curve gives a better match than anything else we’ve tried. Its magnitude is consistent with the calculated greenhouse effect — extra warming from trapped heat radiation. These facts don’t prove causality and they shouldn’t end skepticism, but they raise the bar: to be considered seriously, an alternative explanation must match the data at least as well as carbon dioxide does. Adding methane, a second greenhouse gas, to our analysis doesn’t change the results. Moreover, our analysis does not depend on large, complex global climate models, the huge computer programs that are notorious for their hidden assumptions and adjustable parameters. Our result is based simply on the close agreement between the shape of the observed temperature rise and the known greenhouse gas increase.
What about the future? As carbon dioxide emissions increase, the temperature should continue to rise. I expect the rate of warming to proceed at a steady pace, about one and a half degrees over land in the next 50 years, less if the oceans are included. But if China continues its rapid economic growth (it has averaged 10 percent per year over the last 20 years) and its vast use of coal (it typically adds one new gigawatt per month), then that same warming could take place in less than 20 years.
Science is that narrow realm of knowledge that, in principle, is universally accepted. I embarked on this analysis to answer questions that, to my mind, had not been answered. I hope that the Berkeley Earth analysis will help settle the scientific debate regarding global warming and its human causes. Then comes the difficult part: agreeing across the political and diplomatic spectrum about what can and should be done.
So what do we do next? My money and scholarly efforts are focused on developing site and municipal scale solutions to reduce emissions, increase energy/locational efficiency, and improve the resilience of our cities. But what about the bottom billion and the majority of humanity that isn’t historically responsible for climate change (yet will bear the brunt of the impacts) – there are plenty of efforts that working to improve their standard of living (health, education, food/energy security) while reducing our global footprint. Policy is a huge factor, but don’t count on either national or global consensus or action – the polical/economic forces of the status quo have too much to loose (see ‘Canada’s oil, the world’s carbon‘) – humanity has too much to loose by inaction.
- Berkeley Earth Temperature Averaging Process (commonly referred to as the “Methods” paper) and its appendix
- Influence of Urban Heating on the Global Temperature Land Average
- Earth Atmospheric Land Surface Temperature and Station Quality in the United States
- Decadal Variations in the Global Atmospheric Land Temperatures
- A New Estimate of the Average Earth Surface Land Temperature Spanning 1753 to 2011