- 23 Feb 2019 10:42
#14990002
Going back to Richard Muller in that last video posted, he was, at the time, concerned that climate scientists weren't being open with the methods they used, or when (as was the case with the 'hide the decline' stuff he's going on about in it) they decided to use one data set rather than another (in that case, the scientists decided to use actual thermometer measurements after 1960, rather than tree ring growth, because the calculations from tree ring growth since then don't agree with the thermometer and satellite measurements. Using the most direct measurements is hardly a sneaky trick).
So Muller set up the Berkeley project, to re-examine all the raw data and the processing of it. Their conclusions were:
That's from 2015; global temperatures since then have made it even clearer there has been no meaningful 'hiatus', 'slowdown' or 'stop' in global warming.
So Muller set up the Berkeley project, to re-examine all the raw data and the processing of it. Their conclusions were:
“There were aspects of prior studies that could potentially impair data quality, and we did such a re-examination in our studies. Our broad conclusion: the data are indeed adequate to reach the conclusions that we reached (which are substantially the same, except for some details, with the conclusions of the other groups (NASA, NOAA, HadCru).
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When we turn off all adjustments, we find a slightly GREATER global warming than without! The main effect comes from the ocean data, which is the most difficult to adjust. Take out adjustments, and global warming is stronger; but that is not scientifically justifiable.”
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Global warming is real, about 1.5 Celsius for land measurements over the past 250 years. (Note that Berkeley Earth goes substantially further back in time than do the other studies.
The match to the record of log(CO2) is excellent, better than we obtain with pure math functions (e.g. exponential, parabola) or other indications of world growth (e.g. world population).
The correlation with solar variations is very small, less than 5% (at the 95% confidence level). This effectively rules out solar variability as a cause. We draw a stronger conclusion here than does the IPCC because our data goes back 250 years, and that allows the stronger correlation.
The correlation with volcanic activity is strong, but only in short-lived events. Our analysis clearly shows that the volcanic component did not contribute to the warming trend.
We can eliminate all theories that are capable of making predictions, namely, the solar theory and the volcanic theory and the orbital change (Milankovitch) theory. Note that we are also experts on the orbital theories (having written a technical book on the subject) and can rule them out too. Of course, speculations that there is something else going on which just happens to match the CO2 records can not be ruled out, but it begs the question of why the “unknown” happens to match CO2. Moreover, from simple back-of-the-envelope equations developed long before the warming was seen, we believe that what we are seeing is in the right ballpark to be due to CO2 with water vapor feedback.
“Based on this, we see no competition to the conclusion that global warming is small (1.5 C land over 250 years) but real, and caused by greenhouse gas increases. Speculation that is it not is not based on science in the sense that the competing theories don’t make predictions or testable patterns of behavior. They are not “falsifiable” in the sense of Karl Popper’s fundamental criterion for distinguishing science from non-science.
“Note that we do not claim that “climate change” including droughts, storms, etc is caused by greenhouse gases. We only address global warming. Moreover, as we have written in our memos and Op Eds, the current “pause” in warming is not statistically significant when looked at in light of the kind of variability that has been observed over the last century, likely caused (as we show in one of our published papers) by variations in the flow of ocean currents.
https://www.carbonbrief.org/prof-richar ... or-science
That's from 2015; global temperatures since then have made it even clearer there has been no meaningful 'hiatus', 'slowdown' or 'stop' in global warming.