Guest Post by David Middleton
First it was wheat and now it’s coffee. What’s next? Bacon & eggs?
This is nothing but alarmist nonsense…
Researchers at the Royal Botanic Gardens in Kew and the Environment and Coffee Forest Forum in Addis Ababa, Ethiopia looked at how climate change might make some land unsuitable for Arabica plants, which are highly vulnerable to temperature change and other dangers including pests and disease.
They came up with a best-case scenario that predicts a 38 per cent reduction in land capable of yielding Arabica by 2080. The worst-case scenario puts the loss at between 90 per cent and 100 per cent.
If global climate warming change disruption is likely to wipe out such a prevalent coffee bean in a few decades, the previous few hundred years of warming should have “left a mark” on global coffee production… Right?
I downloaded the latest HadCRUT4 temperature and Mauna Loa CO2 data from Wood for Trees and global coffee bean production from FAOSTAT and it appears that coffee bean trees like warmer temperatures…
And they really like a carbon dioxide-rich diet…
The “how climate change might make some land unsuitable” model was built from the IPCC’s totally bogus emissions scenarios. The modeled scenarios A1B, A2A and B2A.
The models say that “business as usual” will lead to A1-type scenarios (turn Earth into Venus and wipe out coffee). The models say that drastic cuts in carbon emissions are required to stay in the B2-type scenario range.
The actual data indicate that the B2-type scenario is the worst case possibility if we keep “business as usual”.
Furthermore, HadCRUT4 shows absolutely no global warming since late 2000…
Now, if I take HadCRUT4 back to the beginning of 1997, I get this…
(Note: I built this graph back in November.)
Let’s look at the equation of the trend line:
y = 0.0048x – 9.2567
The key part of the equation is the number right before “x.” That’s what’s called the “slope” of the function. The slope is 0.0048 °C per year. This works out to about half-a-degree (0.5 °C) Celsius per century. For reference purposes, the IPCC “forecasted” 1.8 to 4.0 °C per century over the next 100 years, depending on their various socioeconomic scenarios. Here’s the real kicker… The IPCC “forecasted” 0.6 °C of warming over the next century in a scenario in which CO2 remains at the same level as it was in 2000. This is reminiscent of Hanson’s failed 1988 model. The IPCC forecast more warming in a steady-state CO2 world than has actually occurred since 1997.
Now let’s look at the “R²” value…
R² = 0.0334
R² is the “coefficient of determination.” It tells us how well the trend line fits the data. An R² of 1.0 would be a perfect fit. An R² of 0.0 would be no fit. 0.0334 is a lot closer to 0.0 than it is to 1.0. R² is related to explained variance. The linear trend line “explains” about 3.3% of the variation in the temperature data since 1997. 96.7% of the variation was due to natural climatic oscillations (quasi-periodic fluctuations, if you prefer) and stochastic variability.
The scenarios in which coffee beans *might* be threatened, “forecasted” 1.8 to 4.0 °C of warming in the 21st century based on “business as usual” carbon emissions. The actual warming since 1998 has been less than the scenario in which atmospheric CO2 levels stopped rising at the beginning of this century.
Data Sources:
Food and Agriculture Organization of the United Nations, FAO Statistics Division. Coffee bean data downloaded on Feb. 27, 2013.
Hadley Centre. HadCRUT4 tropical temperature data downloaded on February 27, 2013 from Wood for Trees.
NOAA Earth System Research Laboratory. Mauna Loa CO2 data downloaded on February 27, 2013 from Wood for Trees.
Discover more from Watts Up With That?
Subscribe to get the latest posts sent to your email.
Looking at the famous Vostok Ice core temperature graph of the last 400,000 years, I notice that five times the temperature has been significantly higher than present day. How did the coffee plant survive those times?
They’re right in a way…colder temperatures lead to stronger storm systems and more variability. If you look at the LIA, you see a lot of climate variability and episodic food disasters. In circumstances like that, any sensitivity that a species has to temperature will make them vulnerable. Arabica plantations should be seeking ways to protect themselves from freezes and not worry about a little warming.
What’s next? Climate change is causes hemorrhoids?
Er… all these junk studies are a pain in the a$$, so maybe it’s already happening.
Do they have a snoops team to find what’s next in their continuing barrage of what is the next catastrophe of GW (so called)? I am just bewildered by what they come up with!
Ah those Marxist Chickens at CBC are claiming the sky is falling again. They are just as bad as BBC and ABC. Frankly state owned broadcasters should be declared illegal in what is supposed to be a democratic state. They are nothing more than the leftist propaganda arm of the government unions.
If you are Canadian like me — what you hope for most is that CAGW will first “take out” the CBC so that we won’t be nagged and can expire in peace..
Unfortunately these types of breathy, childish badly researched articles are all too common.
Lil Fella from OZ says:
February 27, 2013 at 11:55 am
Do they have a snoops team to find what’s next in their continuing barrage of what is the next catastrophe of GW (so called)? I am just bewildered by what they come up with!
======
Amongst the next ‘great threats to our civilisation’ will be
– a decline in fertility – as male testicles warm, the number and agility of sperm decrease: babies will be extinct by 2020, or sooner;
– an increase in domestic fire deaths – as people will run their air-conditioners into the ground until they spontaneously undergo unplanned incendiary catastrophic dis-assembly;
– a huge incease in immigration into the colder areas – Europe and North America – driven by ‘climate exhaustion’ of peoples who have had their forefathers in the tropics for many years!
– a calamitous decline in property prices in Middle England, as our houses don’t have great overhanging eaves to keep out the Sun [hey – we’re 51 or more degrees North, here].
Given another half hour, I’ll probably double the number of phoney-maroney ‘great threats to our civilization’.
But it gets boring . . . .
Auto
As a tea drinker I say that Global warming can’t come fast enough.
Par for the course at CBC, the constantly biased communists only report items that match their agenda, Patchy’s statement of no warming, got no mention that I know of, Pravda reported more accurately and far sooner than CBC on Climate Gate.
No warming?, no correlation between CO2 emissions and Temp? Never on CBC
They shamelessly shove Dr Fruit Fly down captive viewers craw and weep and moan about how misguided we Canadians are for electing a majority Conservative government and dissing the bogus manmade global warming is sacrilege on their sites.
We can reduce the drain on our coffers, by defunding CBC and the propaganda agents they carry.
All those phoney charities trying to manipulate our energy supplies.
I’m disappointed to see the scathing reception to this research.
It is a valuable examination on what climate change may mean to coffee growing in Ethiopia.
There isn’t a lot of land left there for cultivation and hence little opportunity to protect or expand the area or re-site the of growing coffee trees, particularly as they need shade cover from taller tree species, most of which have been cut down over the centuries.
I have travelled in Ethiopia. There is conflict between the need to protect and regenerate native flora, and provide space for the ever-expanding farmer and his family.
Loss of suitable growing space for coffee will not be made up elsewhere.
The real value of this report is in highlighting the protection of naturally occurring bio-diversity of the Arabica specie. If climate change impacts its current range, we will see the loss of that diversity of naturally occurring cultivars which we will often want to fall back to as a gene bank to enable growing Arabica in diverse points around the world. Much as we go back to other prime crop plant’s wild specie to recover desirable genes we have lost in modern cultivation.
Sad about the headline of David Middleton’s post here.
It completely detracts people from what the report is conveying.
Protection of naturally occurring biodiversity.
The putrid stench of politically correct grant funding overpowering the aroma of coffee.
How tiresome, predictable and wrong.
One minute plants are moving uphill due to global warming. Then the next Arabica faces EXTINCTION. Can these plants move uphill or not?
“A cup of morning coffee could”… I stopped there. When reading something climate related, you can safely stop reading at the word “could”. It’s mark for “what follows has little scientific value”.
And the kicker is, it just wouldn’t matter…
http://coffee.wikia.com/wiki/Arabica
http://en.wikipedia.org/wiki/Hemileia_vastatrix
Coffee between 15 to 24° Celsius and fungus between 10 and 35° Celsius. Coffee screwed with or without “climate change”..
…and they wonder why we tire of the incessant bleating…
The standard of reporting from CBC (ABC, BBC, PBS, and the the rest of the leftist media too) is truly appalling. What is it about the fact that all plants really like a carbon dioxide-rich diet that they cannot comprehend.
What’s the fuss all about?
This is typical ‘climate science’.
Grant addiction = Bad science = Typical ‘climate science’
This matters not. By that time, there will be no humans left to drink the damn stuff, also due to climate change.
Those at CBC News obviously need to get themselves some stronger coffee to wake up those logical brain cells before they die off from under use.. crazy is, crazy does..
Has anyone got a blood Orange recently? It’s a variety of Orange that is sensitive to cold temperatures, they turn red in when they are effected by cold temperatures as the develop, they were very popular during the1800’s.
Has anyone got a blood Orange recently? It’s a variety of Orange that is sensitive to cold temperatures, they turn red when they are effected by cold temperatures as they develop, they were very popular during the1800′s.
Mike Smith says:
February 27, 2013 at 10:26 am
Are we growing tired of the little boys crying “wolf”?
YES!
David,
I really like these diagrams indicating just how silly some of the alarmist people can be, and how out of touch with the available pertinent data.
I’d just like to comment on your use of the word “variation” which changed from “variance” used a few lines earlier. I think it would be better to stick to the real statistical term rather than the semi-colloquial “variation”, which might cause some confusion.
Nearly everyone (Phil Jones excepted) can fit a linear model to climate data, and does so, whether or not it is technically justifiable or sensible. The reason is of course its simplicity and robustness relative to most other models in those cases where you have no a priori reason to believe in a more complex model. One benefit of simple linear regression is that it is very easy to generate “confidence intervals” for the fitted line and for a future observation from the same population. In the strange world of climate investigation no-one ever seems to take this simple and logical next step. Whenever I fit a simple (or higher order) linear model I always generate these intervals. I have to admit that I do not attempt to account for possible serial correlation. Normally this does not worry me, since climate data series, especially monthly data, frequently have large numbers of observations, and even serious deflation of the residual degrees of freedom often has only a small effect on the computed intervals.
A useful feature of of these confidence interval plots is that they indicate visually and immediately the degree of belief that one should have in the properties of the fitted regression. In particular, the inner hyperbolae, showing the confidence intervals for the fitted line, enclose any viable real line that describes the data. Thus, if the two most extreme lines that can be contained by the intervals have slopes that vary between positive and negative values, the fitted equation is not to be believed at the probability used to construct the interval. This is because the slope can take both positive and negative values and still be within the chosen level of probability. I reiterate that in general, lines fitted to climate data fail to provide these invaluable indicators. This leaves the readers unable to judge their reliablility or viability.
Of course, R-Sq is supposed to indicate something to the reader, but in my opinion it serves only to hide some important facts relating to the fit. What should be supplied is “Adjusted R-Sq”, which can take negative values, as well as the conventional “R-Sq”. Without going into the algebra involved (easy, but unfamiliar to most readers of climate blogs, I would guess), a negative value shows with certainty that the regression equation is of no practical value whatsoever. Other statistics that would clarify the value of the fitted line are the “t” values for the coefficient and the probability of such a value occuring by chance. Probabilities below 0.05 would tell you immediately that the regression has something serious to say, at the 95% probability level. Probabilities above this throw statistical doubt on the value of the regression equation at that level. Of course, all these statistics and confidence interval plots are different manifestations of /exactly/ the same numerical stuff. They are algebraically equivalent, but can help in their own ways to shed some light on the arithmetic of regression, and thus on the problem that is being addressed.
Justthinkin says:
February 27, 2013 at 10:41 am
“Isn’t all coffee grown in high altitudes?”
Doesn’t look like it:
http://en.wikipedia.org/wiki/File:Carte_Coffea_robusta_arabic.svg
Looks more like you actively gotta stop those plants from conquering the entire globe.
May I say, LOL:
“Originally, coffee farming was done in the shade of trees that provided a habitat for many animals and insects.[53]
…
This method is commonly referred to as the traditional shaded method, or “shade-grown”. Starting in the 1970s, many farmers switched their production method to sun cultivation, in which coffee is grown in rows under full sun with little or no forest canopy.
”
http://en.wikipedia.org/wiki/Coffee#Cultivation
Oh NOES! Farmers might have to use the old shade-grown method again! The HORRORS!
The poor Coffea arabica survived the Minoan warm period. Just like the polar bears survived an ice free Arctic during the Holocene. / sarc
I am not buying the extinction nonsense because the Earth has land at sea level up to Everest. Vegetation takes advantage of where it’s most hospitable.