If you are confident
of your human attribution, then you can be confident of your estimate of the natural variation.
However the platform does not directly mention climate change or global warming, and does not acknowledge the clear scientific consensus on both the degree
of human attribution and the urgency of action on the issue of climate change.
The authors pull no punches in boldly asserting that the brand
of human attribution science as currently practiced by climate activists such as Michael Mann and Michael Oppenheimer «contradicts the scientific evidence «and engenders a «massive oversimplification» or even «misstatement» of the «true state of the science.»
Those who question (or deny) the «truth»
of these human attribution pronouncements deserve to be marginalized as «climate deniers» and «anti-science.»
Secondly, given that the question
of human attribution largely can not be resolved, its use in promoting visions of disaster constitutes nothing so much as a bait - and - switch scam.
Not exact matches
«
Human - induced climate change likely increased Harvey's total rainfall around Houston by at least 19 percent, with a best estimate
of 37 percent,» Michael Wehner, a co-author on an
attribution study recently published in Geophysical Research Letters, said at the American Geophysical Union conference in December.
It seems to me less arbitrary and more logical to go along with Jennings (quoted by Agar 1943, p. 153), who wrote after years
of study on the behavior
of amoebae: «I am thoroughly convinced, after long study
of the behavior
of this organism, that if Amoeba were a large animal, so as to come within the every day experience
of human beings, its behavior would at once call forth the
attribution to it
of states
of pleasure and pain,
of hunger, desire, and the like, on precisely the same basis as we attribute these things to the dog.»
Another possible issue with
attribution science, he says, is that the current generation
of simulations simply may not be capable
of capturing some
of the subtle changes in the climate and oceans — a particular danger when it comes to studies that find no link to
human activities.
Major challenges in the near future include assigning clearer
attribution to sea ice as a primary driver
of such dynamics, especially in terrestrial systems, and addressing pressures arising from
human use
of arctic coastal and near - shore areas as sea ice diminishes.
The challenge lies in the fact that natural variability is always a part
of any extreme weather event, so when scientists do
attribution exercises, they are trying to discern the
human signal out
of the noise.
«This quantitative
attribution of human and natural climate influences on the IPWP expansion increases our confidence in the understanding
of the causes
of past changes as well as for projections
of future changes under further greenhouse warming,» commented Seung - Ki Min, a professor with POSTECH's School
of Environmental Science and Engineering.
In recent years, a brand
of research called «climate
attribution science» has sprouted from this question, examining the impact
of extreme events to determine how much — often in fractional terms — is related to
human - induced climate change, and how much to natural variability (whether in climate patterns such as the El Niño / La Niña - Southern Oscillation, sea - surface temperatures, changes in incoming solar radiation, or a host
of other possible factors).
And while DNN creations satisfy the first
of these three, the claim to originality and
attribution will depend largely on a given country legislation and on the traceability
of the
human creator.
Nevertheless, the title «
Attribution of polar warming to
human influence» [my emphasis] is a bit misleading.
Atmospheric heatwaves can have significant impacts on
human health31 and
attribution studies have shown that these events, and atmospheric heatwaves in general, have become much more likely as a result
of anthropogenic warming32.
Attribution of precipitation trends suggest evidence
of human influence at latitudes similar to that
of the UK29.
The focus
of the debate on CO2 is not wholly predicated on its
attribution to past forcing (since concern about CO2 emissions was raised long before
human - caused climate change had been clearly detected, let alone attributed), but on its potential for causing large future growth in forcings.
The carbon entity data allows for the differentiation between carbon emissions, produced and marketed by each
of the 90 major multi-national and state - owned coal, oil and gas companies (and their predecessors), and the total
human attribution on climate change impacts.
This is addressed by evaluating change in global or large - scale patterns in the frequency or intensity
of extremes (e.g., observed widespread intensification
of precipitation extremes attributed to
human influence, increase in frequency and intensity
of hot extremes) and by event
attribution methods.
As part
of the World Weather
Attribution (WWA) team CPDN scientists have looked at observational data and model simulations, including weather@home to identify whether and to what extend
human - induced climate change influenced the likelihood and magnitude
of this extreme event.
Such analysis requires an «
attribution study,» which often uses myriad runs
of high - powered computer models to determine the odds
of an event occurring with, and without,
human - caused changes to the atmosphere.
From Wikipedia Anthropomorphism is the
attribution of human characteristics to animals or non-living things, phenomena, material states and objects or abstract concepts.
Attribution is that aspect
of human interaction that assigns significance to an action or an anticipation
of behavior based on expectation.
I agree with you that detection and
attribution are inextricably bound up with models (quantitative, semiquantitative, conceptual)
of what would have happened in the absence
of human interventions (anthropogenic CO2 and other
human interventions need somehow to be distinguished, but they are correlated over the historical record, hence hard to disentangle.)
It doesn't have any influence on the
attribution of current climate changes to
human forcings, it doesn't impact the radiative properties
of CO2, so really, why do you care so much that you are willing to just make up stuff?
I was definitely more ambitious and I go into more detail than Gavin, Andrew and Oliver on how
attribution works, partly because that's what I do, but also because just telling the judge «the IPCC says the warming is pretty much all
human - induced and 80 %
of that is CO2» would have been a bit circular, having been involved myself in those IPCC assessments since the 1990s.
Attribution of observed impacts in the WGII AR5 links responses
of natural and
human systems to climate change, not to anthropogenic climate change, unless explicitly indicated.
What would that imply for our
attribution of current climate changes to
human causes?
* See also Gillett et al, 2008, «
Attribution of polar warming to
human influence» wherein figure 1a shows the same behaviour.
While the basics
of global warming science are now firmly established, climatologists immersed in «
attribution» research, investigating the mix
of factors shaping a particular heat wave, deluge or drought, are still arguing long and hard about whether there is a discernible contribution from
human - driven warming.
I agree with her that there is plenty to debate, both on the science in tough areas like
attribution and climate sensitivity and on what mix
of incentives, investments, policies, communication efforts and other actions can build a more durable
human relationship with the climate system.
Just 1 %
of Tea Partiers think that there is a more than 80 % chance that
humans are primarily to blame for climate change (ie, an IPCC - like statement
of attribution).
There has already been widespread
attribution of this record bleaching event to
human - caused climate change.
The fact that certain analytical conclusions about observed climate change,
attribution to
human causes, in particular the energy system and deforestation, projected greater climate change in the future, observed impacts
of climate change on natural and
human systems, and projected very disruptive consequences in the future given our current trajectory, is not due to «group think» but rather to a generally shared analysis based on evidence.
Joint
attribution involves
attribution of significant changes in a natural or managed system to regional temperature changes, and
attribution of a significant fraction
of the regional temperature change to
human activities.
This is what is called the
attribution problem; that is, how much
of these historical changes are attributable to
human activity, versus natural variability?»
I intend both to «follow the money» (flowing primarily from special interests opposed to regulation or taxation
of greenhouse gas emissions) and to «follow the science» (by exposing the most egregious flaws in the «evidence» against the
attribution of contemporary climate change primarily to
human causes).
Perhaps no paper found in a reputable journal (American Meteorological Society's Weather, Climate, and Society) has been as openly critical
of the narrative «science»
of extreme weather
human attribution as the one just published by University
of Manchester's Janković and Shultz (2017).
Trend scepticism would be disbelieving
of evidence that suggested a change in climate was occurring, whereas
attribution scepticism would be doubtful that such trends were predominantly caused by
human agency.
An asterisk in the column headed «D' indicates that formal detection and
attribution studies were used, along with expert judgement, to assess the likelihood
of a discernible
human influence.
the
attribution of a specific heavy precipitation event to
human - caused GHG's is not an extra development in science that is needed to add to the burden
of proof regarding the
human influence on climate already provided by the current scientific evidence.»
No need to substantively support this «explanation»
of human vs. natural
attribution with actual scientific evidence.
This is not a careful argument, because people — sceptical and not — have been questioning the leaps between observing that the earths temperature changes, the
attribution of that change to
humans, the conclusion that it will cause catastrophe, and that the only way to confront that catastrophe is by mitigating climate change through reduction in emissions.
In summary, there is little new about climate science in the report, and nothing at all new about
attribution of past warming and extreme weather events to
human activity, projections
of future warming and its effects, or potential for catastrophic changes.
Dr. Curry's post analyzes the basic IPCC arguments for
attribution of warming to
humans over the last 50 years.
But it is put to the lie by 1800 comments from governments seeking a resolution
of the IPCC's absurd contradiction in the SPM, that is, increased confidence in
attribution to
humans vs the naturally occurring pause.
''... while claiming «strong evidence» exists that warming has been caused «largely by
human activity», it acknowledges that the size
of future temperature increases and other aspects
of climate change are «still subject to uncertainty» and that the
attribution of forced cl...
On the
attribution question, the results
of Gillett et al. are consistent with the many other
attribution studies we've looked at (i.e. Lean and Rind 2008, Huber and Knutti 2011, and Foster and Rahmstorf 2011)- namely that
humans have been the dominant cause
of the global warming over the past 25 - 150 years (Figure 1).
A general agreement that IF this trend continues for another «X» years despite continued increase
of GHG concentrations, there will be enough evidence in the red column to seriously question the ability
of the GCMs cited by IPCC: a) to correctly assess
human attribution of past climate change b) to estimate climate sensitivity c) to make meaningful projections
of future climate changes due to AGW
The Met Office carries out
attribution studies to assess how
human influence has altered the chances
of a particular event.