I conducted a sixteen-year study of budburst dates in Oklahoma deciduous trees, and I found that winter buds opened in spring earlier and earlier each year, consistent with global warming. The results were highly significant. I did not, however, have time to publish this study in a scientific journal before I retired. I decided instead to publish it on my website. Here is the link to the article, with illustrations. Please note that the mailing address on the cover page is now obsolete; you may contact me through the website email link (stanriceauthor@gmail.com).
Here is what I indicated on my website:
Global warming is something that is already changing the world in a way that will make human civilization difficult. One indicator of global warming is that buds open sooner in the spring than they did previously. Here you will see the evidence.
It is difficult to think of a more important scientific topic today than global warming. The Earth is getting warmer far more than it ever did in the past by natural climatic variation, and the reason is clear: humans are putting massive amounts of carbon dioxide into the atmosphere. There are many consequences of this, for the natural world and the human world (for example, food production). The subject could fill an encyclopedia; as a matter of fact, I was under contract to write the Encyclopedia of Global Warming for Facts on File, but they discontinued the project before I had written any actual entries, just the overview.
Every scientist and scholar, except for fringe people who are either dedicated to extremist politics or paid by corporations, accept the reality of global warming and its human cause. Even many Republicans accept it, although most of them have now been kicked out of the Party. Even Exxon-Mobil accepted it decades ago, until they repudiated their own research for political reasons. The United States is the only major country in the world in which the government opposes the science of global warming. First George W. Bush, then Donald Trump, removed global warming from government websites. Other countries, such as in Europe, know that they can no longer trust American scientific information about global warming.
One reason for this worldwide acceptance of the science of global warming is that it is confirmed by the convergence of many different lines of research. Fields as different as meteorology, geology, and biology all confirm that global warming is real. One small area of research is one in which I was involved: phenology, which is the seasonal patterns of biological activity. In particular, deciduous trees lose their leaves every autumn and open new buds in the springtime. In recent decades, with global warming, tree buds have been opening earlier and earlier in the spring.
Many different sets of data confirm this. Many of them result from satellite measurements which show that forests turn green earlier every spring. Some are based on direct observations of trees and other plants. I have a data set that I worked on for sixteen years and that had over six thousand data points. These observations showed that, in my sample of deciduous trees, budburst occurred about a day earlier every year from 2006 to 2021. There are two particular points in which my data set is important. First, they come from Oklahoma, near the southwestern extreme of the deciduous forests, while most data sets are from the northeast United States or from Europe. Second, my data are longitudinal; that is, I kept track of the same trees for sixteen years. This is longer than the lifetime of any research grant; but my research required no funding. I just kept data sheets about budburst times on the trees near where I lived and worked.
The saying goes, Extraordinary claims require extraordinary evidence. But my claims were not extraordinary. They are the same as everyone else’s, even though they were based on an entirely separate data set. If my observations were different from everyone else’s, they might be suspect. But my conclusions are the same as those of nearly everyone else who has studied the changes in spring budburst resulting from global warming. As such, my conclusions are not particularly surprising, except that the fact that the trees opened their buds a day earlier each year much surpasses most studies, in which budburst occurs a day earlier each decade.
This photo shows post oak (Quercus stellata) buds just beginning to open.
In the next essay, I will address some particularly interesting features of this research project, which will give us an insight into the process of scientific thinking.



