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Consensus On Consensus: Climate Experts Agree On Human-Caused Global Warming (theguardian.com)
mspohr quotes a report from The Guardian written by Dana Nuccitelli, environmental scientist and contributor to SkepticalScience.com: There is an overwhelming expert scientific consensus on human-caused global warming. Authors of seven previous climate consensus studies -- including Naomi Oreskes, Peter Doran, William Anderegg, Bart Verheggen, Ed Maibach, J. Stuart Carlton, John Cook, [Dana Nuccitelli] and six of her colleagues -- have co-authored a new paper that should settle this question once and for all. The two key conclusions from the paper are: 1) Depending on exactly how you measure the expert consensus, it's somewhere between 90% and 100% that agree humans are responsible for climate change, with most of our studies finding 97% consensus among publishing climate scientists. 2) The greater the climate expertise among those surveyed, the higher the consensus on human-caused global warming.
Quoted from IOPscience: Consensus on consensus: a synthesis of consensus estimates on human-caused global warming. The consensus that humans are causing recent global warming is shared by 90%-100% of publishing climate scientists according to six independent studies by co-authors of this paper. Those results are consistent with the 97% consensus reported by Cook et al based on 11 944 abstracts of research papers, of which 4014 took a position on the cause of recent global warming. A survey of authors of those papers also supported a 97% consensus. Tol comes to a different conclusion using results from surveys of non-experts such as economic geologists and a self-selected group of those who reject the consensus. We demonstrate that this outcome is not unexpected because the level of consensus correlates with expertise in climate science. At one point, Tol also reduces the apparent consensus by assuming that abstracts that do not explicitly state the cause of global warming ('no position') represent non-endorsement, an approach that if applied elsewhere would reject consensus on well-established theories such as plate tectonics. We examine the available studies and conclude that the finding of 97% consensus in published climate research is robust and consistent with other surveys of climate scientists and peer-reviewed studies.
Quoted from IOPscience: Consensus on consensus: a synthesis of consensus estimates on human-caused global warming. The consensus that humans are causing recent global warming is shared by 90%-100% of publishing climate scientists according to six independent studies by co-authors of this paper. Those results are consistent with the 97% consensus reported by Cook et al based on 11 944 abstracts of research papers, of which 4014 took a position on the cause of recent global warming. A survey of authors of those papers also supported a 97% consensus. Tol comes to a different conclusion using results from surveys of non-experts such as economic geologists and a self-selected group of those who reject the consensus. We demonstrate that this outcome is not unexpected because the level of consensus correlates with expertise in climate science. At one point, Tol also reduces the apparent consensus by assuming that abstracts that do not explicitly state the cause of global warming ('no position') represent non-endorsement, an approach that if applied elsewhere would reject consensus on well-established theories such as plate tectonics. We examine the available studies and conclude that the finding of 97% consensus in published climate research is robust and consistent with other surveys of climate scientists and peer-reviewed studies.
1. A tech breakthrough in energy production.
We already have nuclear technology available to us, ready to implement that produces nearly no waste (by reprocessing), is very safe, and burns much more abundant thorium for fuel (also burns most of what we currently consider waste, via reprocessing.) It would solve energy needs for the foreseeable future. Why is no one building these things?
"Some sort of impact" sounds like weasel words to me. The linked paper shows six independent studies that all agree; the consensus of 90-100% of scientists is that:
human influence has been the dominant cause of the observed warming since the mid-20th century
Which is a much stronger statement than you make out. Also, agreement with this position is correlated with expertise.
The exact climate sensitivity is still being debated, but your links are nearly five years out of date.
Why would anyone engrave "Elbereth"?
A more accurate statement:
Not really.
1. Over 90% of scientists think the Earth is more likely to be warming up than cooling down.
Yes, that's what TFA says.
Even skeptics usually agree with this.
Actually, the reason for studies like this is because there are plenty of "skeptics" (read, "deniers") who do NOT agree with this. Every time there's a story on Slashdot about climate change, there's a whole group of people who come out of the woodwork and try to cite how the data from the past X number of years is bad and the warming trend isn't real, etc. Or global cooling was a thing not so long ago. Or whatever.
Yes, legitimate "skeptics" about the role of humans in climate change do generally believe that the planet is still warming. But there are plenty of others who dispute that.
2. Most of these scientists said humans had some sort of impact on the climate, but exactly how much was under debate.
Actually, most of the studies cited in TFA required that the respondents committed to belief that humans were a "significant" contributor to climate change, and some asked respondents whether humans were the "dominant" cause. The wording varied from study to study, and you can read the details in the full metastudy.
Regardless, most of the studies in TFA imply something much stronger than your statement.
In fact, the consensus view at present is that the impact of CO2 is overestimated.
Nope. That's not the current consensus view. There have been some studies which have rejected the more dire models for CO2. But your links are a few years old. Basically, your links are referring to issues where models didn't predict the "slowdown" in climate change that happened in the early 2000s. It has now picked up again.
And this is likely just due to random elements in a chaotic system. Subsequent studies have suggested that randomness in the earth's climate from year-to-year probably has multiple times the amount of impact that alterations to the CO2 model (or other factors, like sunlight absorption models, ocean absorption models, etc.) have.
Bottom line: the validity of these models has to be judged over longer timespans, to avoid the year-to-year blips in a chaotic system. With that taken into account, the general CO2 models likely aren't that far off.
Warming fears are the “worst scientific scandal in the historyWhen people come to know what the truth is, they will feel deceived by science and scientists.” – UN IPCC Japanese Scientist Dr. Kiminori Itoh, an award-winning PhD environmental physical chemist.
"According to Google Scholar and Yokohama National University, Dr. Itoh has not published any work in the area of climate change in peer-reviewed science journals." (http://www.desmogblog.com/kiminori-itoh).
Also of interest is this which is the article which (for some reason) you seem to have copied verbatim. Not sure why, since the guy who was actually in the debate says:
I had a debate with a denier on Google+ the other day. He quoted 18 scientists to support his argument. But when I actually had a close look at them, they weren’t very persuasive. Of the 18, only 12 of the quotes were specifically denying man-made climate change. The rest were just peripheral. And of the 12 that specifically denied it, only 1 was from an actual climate scientist (Dr. Steven M. Japar).
Really, you shouldn't post things that can be so easily googled.