by A. May, Nov 9, 2021 in WUWT

I had a very interesting online discussion about CO₂ and temperature with Tinus Pulles, a retired Dutch environmental scientist. To read the whole discussion, go to the comments at the end of this post. He presented me with a graphic from Dr. Robert Rohde from twitter that you can find here. It is also plotted below, as Figure 1.

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Conclusion

I’m not impressed with Rohde’s display. The coefficient of correlation is decent, but it does not show that warming is controlled by changes in CO₂, the temperature reversals are not explained. The reversals strongly suggest that natural forces are playing a significant role in the warming and can reverse the influence of CO₂. The plots show that, at most, CO₂ explains about 50% of the warming, something else, like solar changes, must be causing the reversals. If they can reverse the CO₂-based warming and overwhelm the influence of CO₂ they are just as strong.