Is there legitimate scientific debate about the accuracy of the hockey stick graph?
Yes, but mainly about the details, not the essential point. Temperature fluctuations that predate written records are preserved in natural archives (e.g., tree rings, ice cores, boreholes) with various time periods (e.g., seasonal, annual, decadal). The scientific discussion has focused on the best statistical method for combining these various records to accurately capture temperature fluctuations for the Northern Hemisphere. As is typical of the scientific process, independent teams of researchers have worked to reproduce the results of the “hockey stick” by using their own approaches and even by using slightly different data. These studies sometimes produce slightly higher temperature fluctuations in the past compared with the initial study. But despite their differences, they still yield the same essential conclusion: the past 10- to 20-year period was likely the warmest of the past millennium. 5. How much does our understanding of global warming depend on the hockey stick graph? T
