The top ten global warming 'skeptic' arguments answered

[The Nature Boy 4,224]

http://www.theguardian.com/environment/climate-consensus-97-per-cent/2014/may/06/top-ten-global-warming-skeptic-arguments-debunked

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The top ten global warming 'skeptic' arguments answered
Contrarian climate scientist Roy Spencer put forth the top 10 'skeptic' arguments - all are easily answered

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Global temperatures are rising, and the top 10 climate contrarian explanations are not good. Photograph: Aaron Tilley for the Guardian

Roy Spencer is one of the less than 3% of climate scientists whose research suggests that humans are playing a relatively minimal role in global warming. As one of those rare contrarian climate experts, he's often asked to testify before US Congress and interviewed by media outlets that want to present a 'skeptical' or false balance climate narrative. He's also a rather controversial figure, having made remarks about "global warming Nazis" and said,

"I view my job a little like a legislator, supported by the taxpayer, to protect the interests of the taxpayer and to minimize the role of government."

In any case, as one of those rare contrarian climate scientists, Spencer is in a good position to present the best arguments against the global warming consensus. Conveniently, he recently did just that on his blog, listing what he considers the "Top Ten Good Skeptical Arguments," throwing in an 11th for good measure. He also conveniently posed each of these arguments as questions; it turns out they're all easy to answer.

1) No Recent Warming. If global warming science is so "settled", why did global warming stop 15 years ago, contrary to all "consensus" predictions?

Quite simply, it hasn't. Even global surface temperatures (which is how Spencer is likely measuring 'global warming', although they only account for about 2% of the Earth's warming), have warmed about 0.2°C over the past 15 years, according to the best available measurements. More importantly, the planet has continued to accumulate heat at a rate equivalent to 4 Hiroshima atomic bomb detonations per second over the past 15 years.

2) Natural or Manmade? If we don't know how much of recent warming is natural, then how can we know how much is manmade?

We do.
Net human and natural percent contributions to the observed global surface warming over the past 50-65 years according to Tett et al. 2000 (T00, dark blue), Meehl et al. 2004 (M04, red), Stone et al. 2007 (S07, light green), Lean and Rind 2008 (LR08, purple), Huber and Knutti 2011 (HK11, light blue), Gillett et al. 2012 (G12, orange), Wigley and Santer 2012 (WS12, dark green), and Jones et al. 2013 (J12, pink). Net human and natural percent contributions to the observed global surface warming over the past 50-65 years according to Tett et al. 2000 (T00, dark blue), Meehl et al. 2004 (M04, red), Stone et al. 2007 (S07, light green), Lean and Rind 2008 (LR08, purple), Huber and Knutti 2011 (HK11, light blue), Gillett et al. 2012 (G12, orange), Wigley and Santer 2012 (WS12, dark green), and Jones et al. 2013 (J12, pink).

The IPCC stated with 95% confidence that most of the global warming since 1950 is human-caused, with a best estimate that 100% is due to humans over the past 60 years. The IPCC was able to draw this conclusion with such high confidence because that's what the scientific evidence and research clearly and consistently concludes.

3) IPCC Politics and Beliefs. Why does it take a political body (the IPCC) to tell us what scientists "believe"? And when did scientists' "beliefs" translate into proof? And when was scientific truth determined by a vote…especially when those allowed to vote are from the Global Warming Believers Party?

The IPCC merely organizes the world's top climate scientists every 5 to 7 years. It's those scientists who summarize the up-to-date status of the scientific research in their respective fields of expertise. The IPCC report and the 97% expert consensus on human-caused global warming are themselves not proof of anything. They summarize and reflect the scientific evidence – that vast body of evidence is the reason the consensus exists.

4) Climate Models Can't Even Hindcast. How did climate modelers, who already knew the answer, still fail to explain the lack of a significant temperature rise over the last 30+ years? In other words, how to you botch a hindcast?

Global surface temperatures have risen more than 0.5°C over the past 30 years. That rise is significant, both in the statistical and figurative sense. Climate models have accurately reproduced that rise.

5) …But We Should Believe Model Forecasts? Why should we believe model predictions of the future, when they can't even explain the past?

Climate models have accurately reproduced the past, but let's put them aside for a moment. We don't need climate models to project future global warming. We know from past climate change events the planet will warm between about 1.5 and 4.5°C from the increased greenhouse effect of a doubling of atmospheric carbon dioxide (the 'climate sensitivity').

In a business-as-usual scenario, atmospheric carbon dioxide levels are expected to surpass 900 ppm by 2100 – that's close to two doublings from the pre-industrial level of 280 ppm. Hence we know that business-as-usual will cause between 2.5 and 7.5°C (most likely 5°C) warming if we stop carbon dioxide levels from rising beyond about 900 ppm. This is based on simple math and what we know about the physics of the climate – no fancy models needed.

6) Modelers Lie About Their "Physics". Why do modelers insist their models are based upon established physics, but then hide the fact that the strong warming their models produce is actually based upon very uncertain "fudge factor" tuning?

Putting aside the accusation that hundreds of climate modelers are all liars – the answer is that their models are indeed based upon well established physics. NASA climate modeler Gavin Schmidt's TED talk on the subject is well worth watching.

Spencer's question likely refers to the uncertain size of the cooling influence of aerosols. However, that is a physical uncertainty. We don't have very good measurements of this effect; unfortunately the rocket carrying NASA's Glory satellite that had instruments to measure the climate effect of aerosols crashed two years ago. Nevertheless, climate models use the available data to account for their influence, and their projections include the associated uncertainties.

7) Is Warming Even Bad? Who decided that a small amount of warming is necessarily a bad thing?

We're headed for about 5°C global surface warming above pre-industrial temperatures by 2100 if we continue on a business-as-usual path. 5°C is the difference between average temperatures now and those during the last ice age. That's not "small" by any stretch of the imagination. As for who decided that amount warming is a bad thing – climate scientists researching the impacts of climate change.

8) Is CO2 Bad? How did carbon dioxide, necessary for life on Earth and only 4 parts in 10,000 of our atmosphere, get rebranded as some sort of dangerous gas?

Carbon dioxide itself is not "bad." Water is also necessary for life. Too much water will kill you. Too much carbon dioxide causes dangerous climate change. Greenhouse gases were determined to be pollutants as defined in the US Clean Air Act . This was a ruling of the (politically conservative) US Supreme Court.

9) Do We Look that Stupid? How do scientists expect to be taken seriously when their "theory" is supported by both floods AND droughts? Too much snow AND too little snow?

This question is a bit like asking, "Do I look fat?". Do you want an honest answer?

The warming of the atmosphere, happening especially at high latitudes, reduces the temperature difference between higher and lower latitudes. This tends to make storms move more slowly. This results in storms dumping more precipitation in localized areas, which causes more flooding in those areas and droughts outside of them. Higher temperatures also increase evaporation, exacerbating droughts and adding more moisture to the air for stronger storms. A climate scientist should understand these concepts.

10) Selective Pseudo-Explanations. How can scientists claim that the Medieval Warm Period (which lasted hundreds of years), was just a regional fluke…yet claim the single-summer (2003) heat wave in Europe had global significance?

There is no contradiction here – a regional event can have global significance, for example via economic impacts. In any case, the Medieval Warm Period was a regional phenomenon and the planet as a whole was cooler than today.

11) (Spinal Tap bonus) Just How Warm is it, Really? Why is it that every subsequent modification/adjustment to the global thermometer data leads to even more warming? What are the chances of that? Either a warmer-still present, or cooling down the past, both of which produce a greater warming trend over time. And none of the adjustments take out a gradual urban heat island (UHI) warming around thermometer sites, which likely exists at virtually all of them — because no one yet knows a good way to do that.

Ironically, most of the adjustments to Spencer's own satellite temperature data set have been in the warming direction, so this question may be an example of psychological projection. Scientists also recently identified a problem in Arctic temperature data analysis that's leading to an incorrect adjustment in the cooling direction, and there have of course been other cooling adjustments in the surface temperature record. The urban heat island effect has also been demonstrated over and over to have no significant influence on the surface temperature record.
Notice a Pattern?

You may have noticed some patterns in these questions. Most are based on false premises and are trivially simple to answer. These 'top ten good skeptic arguments' are frankly not very good or challenging. They also reveal a very one-sided skepticism, although to his credit Spencer did also list 10 'skeptic' arguments that don't hold water. These are glaringly wrong arguments like 'there is no greenhouse effect' and 'CO2 cools the atmosphere,' that some contrarians nevertheless believe. Interestingly, Spencer discusses the science disproving the 10 bad arguments, but there's no scientific discussion supporting his to 'good' arguments.

From reading and answering Spencer's questions, we learn that the basic science behind how we know humans are causing global warming and that it's a problem are quite well-established. There are some remaining uncertainties, like how much warming is being offset by aerosol cooling, but overall we have a very strong understanding of the big picture. For quite a while now we've understood the Earth's climate well enough to know that we can't continue on our current high-risk path.

When will we stop using these trivially wrong contrarian arguments as an excuse for climate inaction? Now that's a tough question to answer.
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Dana Nuccitelli Posted by
Dana Nuccitelli
Tuesday 6 May 2014 09.00 EDT theguardian.com

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[Mr. Big Dog 10,747]

[Neonred 3,562]

2) Natural or Manmade? If we don't know how much of recent warming is natural, then how can we know how much is manmade?

We do.

Net human and natural percent contributions to the observed global surface warming over the past 50-65 years according to Tett et al. 2000 (T00, dark blue), Meehl et al. 2004 (M04, red), Stone et al. 2007 (S07, light green), Lean and Rind 2008 (LR08, purple), Huber and Knutti 2011 (HK11, light blue), Gillett et al. 2012 (G12, orange), Wigley and Santer 2012 (WS12, dark green), and Jones et al. 2013 (J12, pink). Net human and natural percent contributions to the observed global surface warming over the past 50-65 years according to Tett et al. 2000 (T00, dark blue), Meehl et al. 2004 (M04, red), Stone et al. 2007 (S07, light green), Lean and Rind 2008 (LR08, purple), Huber and Knutti 2011 (HK11, light blue), Gillett et al. 2012 (G12, orange), Wigley and Santer 2012 (WS12, dark green), and Jones et al. 2013 (J12, pink).

The IPCC stated with 95% confidence that most of the global warming since 1950 is human-caused, with a best estimate that 100% is due to humans over the past 60 years. The IPCC was able to draw this conclusion with such high confidence because that's what the scientific evidence and research clearly and consistently concludes.

Do I believe there is global warming? Sure.

Do I believe it is man made? Perhaps. Likely related the exploding world population. My contention is that if we reduce the worlds population by a few billion that would have the greatest effect on curbing man made global warming.

Let's see....the combined population of China and India is.....

[GandD 5,966]

These are humans you're talking about.

[Teddy B 17,252]

These are humans you're talking about.

Not to everyone they're not. Besides the Middle East and Chicago are the obvious first choices.

Edited July 25, 2014 by Teddy B

[Trumplestiltskin 5,791]

Do I believe there is global warming? Sure.

Do I believe it is man made? Perhaps. Likely related the exploding world population. My contention is that if we reduce the worlds population by a few billion that would have the greatest effect on curbing man made global warming.

Let's see....the combined population of China and India is.....

Why do you deserve to live more than they do?

Surely the Christian thing to do is offer your own life for the good of mankind.

[Boiler 45,514]

If you have any Global Warming send it my way, weather this year has been #######.

[mota bhai 2,675]

http://www.theguardian.com/environment/climate-consensus-97-per-cent/2014/may/06/top-ten-global-warming-skeptic-arguments-debunked

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The top ten global warming 'skeptic' arguments answered

Contrarian climate scientist Roy Spencer put forth the top 10 'skeptic' arguments - all are easily answered

Share 1879

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inShare65

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Thermometer

Global temperatures are rising, and the top 10 climate contrarian explanations are not good. Photograph: Aaron Tilley for the Guardian

Roy Spencer is one of the less than 3% of climate scientists whose research suggests that humans are playing a relatively minimal role in global warming. As one of those rare contrarian climate experts, he's often asked to testify before US Congress and interviewed by media outlets that want to present a 'skeptical' or false balance climate narrative. He's also a rather controversial figure, having made remarks about "global warming Nazis" and said,

"I view my job a little like a legislator, supported by the taxpayer, to protect the interests of the taxpayer and to minimize the role of government."

In any case, as one of those rare contrarian climate scientists, Spencer is in a good position to present the best arguments against the global warming consensus. Conveniently, he recently did just that on his blog, listing what he considers the "Top Ten Good Skeptical Arguments," throwing in an 11th for good measure. He also conveniently posed each of these arguments as questions; it turns out they're all easy to answer.

1) No Recent Warming. If global warming science is so "settled", why did global warming stop 15 years ago, contrary to all "consensus" predictions?

Quite simply, it hasn't. Even global surface temperatures (which is how Spencer is likely measuring 'global warming', although they only account for about 2% of the Earth's warming), have warmed about 0.2°C over the past 15 years, according to the best available measurements. More importantly, the planet has continued to accumulate heat at a rate equivalent to 4 Hiroshima atomic bomb detonations per second over the past 15 years.

2) Natural or Manmade? If we don't know how much of recent warming is natural, then how can we know how much is manmade?

We do.

Net human and natural percent contributions to the observed global surface warming over the past 50-65 years according to Tett et al. 2000 (T00, dark blue), Meehl et al. 2004 (M04, red), Stone et al. 2007 (S07, light green), Lean and Rind 2008 (LR08, purple), Huber and Knutti 2011 (HK11, light blue), Gillett et al. 2012 (G12, orange), Wigley and Santer 2012 (WS12, dark green), and Jones et al. 2013 (J12, pink). Net human and natural percent contributions to the observed global surface warming over the past 50-65 years according to Tett et al. 2000 (T00, dark blue), Meehl et al. 2004 (M04, red), Stone et al. 2007 (S07, light green), Lean and Rind 2008 (LR08, purple), Huber and Knutti 2011 (HK11, light blue), Gillett et al. 2012 (G12, orange), Wigley and Santer 2012 (WS12, dark green), and Jones et al. 2013 (J12, pink).

The IPCC stated with 95% confidence that most of the global warming since 1950 is human-caused, with a best estimate that 100% is due to humans over the past 60 years. The IPCC was able to draw this conclusion with such high confidence because that's what the scientific evidence and research clearly and consistently concludes.

3) IPCC Politics and Beliefs. Why does it take a political body (the IPCC) to tell us what scientists "believe"? And when did scientists' "beliefs" translate into proof? And when was scientific truth determined by a vote…especially when those allowed to vote are from the Global Warming Believers Party?

The IPCC merely organizes the world's top climate scientists every 5 to 7 years. It's those scientists who summarize the up-to-date status of the scientific research in their respective fields of expertise. The IPCC report and the 97% expert consensus on human-caused global warming are themselves not proof of anything. They summarize and reflect the scientific evidence – that vast body of evidence is the reason the consensus exists.

4) Climate Models Can't Even Hindcast. How did climate modelers, who already knew the answer, still fail to explain the lack of a significant temperature rise over the last 30+ years? In other words, how to you botch a hindcast?

Global surface temperatures have risen more than 0.5°C over the past 30 years. That rise is significant, both in the statistical and figurative sense. Climate models have accurately reproduced that rise.

5) …But We Should Believe Model Forecasts? Why should we believe model predictions of the future, when they can't even explain the past?

Climate models have accurately reproduced the past, but let's put them aside for a moment. We don't need climate models to project future global warming. We know from past climate change events the planet will warm between about 1.5 and 4.5°C from the increased greenhouse effect of a doubling of atmospheric carbon dioxide (the 'climate sensitivity').

In a business-as-usual scenario, atmospheric carbon dioxide levels are expected to surpass 900 ppm by 2100 – that's close to two doublings from the pre-industrial level of 280 ppm. Hence we know that business-as-usual will cause between 2.5 and 7.5°C (most likely 5°C) warming if we stop carbon dioxide levels from rising beyond about 900 ppm. This is based on simple math and what we know about the physics of the climate – no fancy models needed.

6) Modelers Lie About Their "Physics". Why do modelers insist their models are based upon established physics, but then hide the fact that the strong warming their models produce is actually based upon very uncertain "fudge factor" tuning?

Putting aside the accusation that hundreds of climate modelers are all liars – the answer is that their models are indeed based upon well established physics. NASA climate modeler Gavin Schmidt's TED talk on the subject is well worth watching.

Spencer's question likely refers to the uncertain size of the cooling influence of aerosols. However, that is a physical uncertainty. We don't have very good measurements of this effect; unfortunately the rocket carrying NASA's Glory satellite that had instruments to measure the climate effect of aerosols crashed two years ago. Nevertheless, climate models use the available data to account for their influence, and their projections include the associated uncertainties.

7) Is Warming Even Bad? Who decided that a small amount of warming is necessarily a bad thing?

We're headed for about 5°C global surface warming above pre-industrial temperatures by 2100 if we continue on a business-as-usual path. 5°C is the difference between average temperatures now and those during the last ice age. That's not "small" by any stretch of the imagination. As for who decided that amount warming is a bad thing – climate scientists researching the impacts of climate change.

8) Is CO2 Bad? How did carbon dioxide, necessary for life on Earth and only 4 parts in 10,000 of our atmosphere, get rebranded as some sort of dangerous gas?

Carbon dioxide itself is not "bad." Water is also necessary for life. Too much water will kill you. Too much carbon dioxide causes dangerous climate change. Greenhouse gases were determined to be pollutants as defined in the US Clean Air Act . This was a ruling of the (politically conservative) US Supreme Court.

9) Do We Look that Stupid? How do scientists expect to be taken seriously when their "theory" is supported by both floods AND droughts? Too much snow AND too little snow?

This question is a bit like asking, "Do I look fat?". Do you want an honest answer?

The warming of the atmosphere, happening especially at high latitudes, reduces the temperature difference between higher and lower latitudes. This tends to make storms move more slowly. This results in storms dumping more precipitation in localized areas, which causes more flooding in those areas and droughts outside of them. Higher temperatures also increase evaporation, exacerbating droughts and adding more moisture to the air for stronger storms. A climate scientist should understand these concepts.

10) Selective Pseudo-Explanations. How can scientists claim that the Medieval Warm Period (which lasted hundreds of years), was just a regional fluke…yet claim the single-summer (2003) heat wave in Europe had global significance?

There is no contradiction here – a regional event can have global significance, for example via economic impacts. In any case, the Medieval Warm Period was a regional phenomenon and the planet as a whole was cooler than today.

11) (Spinal Tap bonus) Just How Warm is it, Really? Why is it that every subsequent modification/adjustment to the global thermometer data leads to even more warming? What are the chances of that? Either a warmer-still present, or cooling down the past, both of which produce a greater warming trend over time. And none of the adjustments take out a gradual urban heat island (UHI) warming around thermometer sites, which likely exists at virtually all of them — because no one yet knows a good way to do that.

Ironically, most of the adjustments to Spencer's own satellite temperature data set have been in the warming direction, so this question may be an example of psychological projection. Scientists also recently identified a problem in Arctic temperature data analysis that's leading to an incorrect adjustment in the cooling direction, and there have of course been other cooling adjustments in the surface temperature record. The urban heat island effect has also been demonstrated over and over to have no significant influence on the surface temperature record.

Notice a Pattern?

You may have noticed some patterns in these questions. Most are based on false premises and are trivially simple to answer. These 'top ten good skeptic arguments' are frankly not very good or challenging. They also reveal a very one-sided skepticism, although to his credit Spencer did also list 10 'skeptic' arguments that don't hold water. These are glaringly wrong arguments like 'there is no greenhouse effect' and 'CO2 cools the atmosphere,' that some contrarians nevertheless believe. Interestingly, Spencer discusses the science disproving the 10 bad arguments, but there's no scientific discussion supporting his to 'good' arguments.

From reading and answering Spencer's questions, we learn that the basic science behind how we know humans are causing global warming and that it's a problem are quite well-established. There are some remaining uncertainties, like how much warming is being offset by aerosol cooling, but overall we have a very strong understanding of the big picture. For quite a while now we've understood the Earth's climate well enough to know that we can't continue on our current high-risk path.

When will we stop using these trivially wrong contrarian arguments as an excuse for climate inaction? Now that's a tough question to answer.

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Dana Nuccitelli Posted by

Dana Nuccitelli

Tuesday 6 May 2014 09.00 EDT theguardian.com

Jump to comments (760)

Print this

Article history

Environment

Climate change ·

Climate change scepticism

Science

Climate change

Series

Guardian Environment Blogs

More from Climate Consensus - the 97% on

Environment

Climate change ·

Climate change scepticism

Science

Climate change

Series

Guardian Environment Blogs

More blogposts

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Previous

Blog home

Geez, would it hurt you to format your stuff a little? New line breaks, take out the freakin nav labels. WTH.

[GandD 5,966]

If you have any Global Warming send it my way, weather this year has been #######.

Derp.

Bring back the dog. I like the dog.

[The Nature Boy 4,224]

I will jump all over the format thing as soon as I git my spell chick fixed

[OnMyWayID 1,489]

Geez, would it hurt you to format your stuff a little? New line breaks, take out the freakin nav labels. WTH.

Who's going to read it?? Climate deniers? Funny!

[The Nature Boy 4,224]

Who's going to read it?? Climate deniers? Funny!

You know I joke around a lot, but when I am super lazy, and someone posts a wall of text. I wait until the 2 and 3 line artillery barrages start to figure out what it's all about. or until the liburuls endorse it or +1 it.

[Trumplestiltskin 5,791]

You know I joke around a lot, but when I am super lazy, and someone posts a wall of text. I wait until the 2 and 3 line artillery barrages start to figure out what it's all about. or until the liburuls endorse it or +1 it.

Or you could go out...

[GandD 5,966]

Who's going to read it?? Climate deniers? Funny!

You're getting the hang of the one liners. Congrats!

[OnMyWayID 1,489]

You're getting the hang of the one liners. Congrats!

Thanks.. they are empty calories... Sometimes those taste the best

Edited July 25, 2014 by OnMyWayID