Amount of carbon released from the Earth is about the same as released by deforestation
- Ian Johnston Environment Correspondent
- @montaukian
- Tuesday 29 August 2017 19:25 BST
The degradation of the Earth’s soil by humans has been an environmental catastrophe on a similar scale to the deforestation of much of the planet, a new study suggests.
Experts estimated that 133 billion tonnes of carbon has been removed from the top two metres of soil since farming began some 12,000 years ago, about the same as the total amount lost from vegetation.
However the figure is still dwarfed by the 450 billion tonnes of carbon emitted since the Industrial Revolution began and humans started burning fossil fuels on an unprecedented scale.
Soil is obviously vitally important for the growth of crops that feed humans and livestock. Concern has been growing what some refer to as the “soil fertility crisis”, a problem that can be masked by the use of artificial fertilisers.
Carbon released from the soil also contributes to global warming.
But the researchers suggested the figures showed the potential for soil to absorb carbon, something that could be used to reduce the level of the greenhouse gas in the atmosphere by using different agricultural techniques.
Writing in the journal Proceedings of the National Academy of Sciences, they said: “The incredible rise of human civilizations and the continuing sustainability of current and future human societies are inextricably linked to soils and the wide array of services soils provide.
“Human population and economic growth has led to an exponential rise in use of soil resources.
“The consequences of human domination of soil resources are far ranging: accelerated erosion, desertification, salinization, acidification, compaction, biodiversity loss, nutrient depletion, and loss of soil organic matter.
“Of these soil threats, loss of soil organic matter has received the most attention, due to the critical role [it] plays in the contemporary carbon cycle and as a key component of sustaining food production.”
The total figure for the lost carbon was estimated at 133 billion tonnes, saying: “These soil-organic-carbon losses are on par with estimates of carbon lost from living vegetation primarily due to deforestation.”
The researchers found the UK, northern and central Europe, parts of China and the US corn belt were particular hotspots.
This is partly because of the high levels of carbon that would have originally been in the soil in these areas, but also the type of farming typically practised there.
Unsurprisingly, losses from cropland were significantly higher than from land used for grazing animals. But arid grasslands were also vulnerable if they were over-grazed, leading to significant erosion.
One of the researchers, Dr Jonathan Sanderman, of the Woods Hole Research Centre in Massachusetts, told the website Carbon Brief: “Considering humans have emitted about 450 billion tonnes of carbon since the industrial revolution, soil carbon losses to the atmosphere may represent 10 to 20 per cent of this number.
Read the rest of the story here.
HT/DMH
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Makes you want to scream….don’t it?
Here a catastrophe…there a catastrophe….everywhere a catastrophe
So, if there is 6.6 billion people out there and excreting CO2 at the rate of 0.9 or 0.565 kg/day, the total CO2 emission by human alone annually is: CO2 emission = 0.90 X 365 x 6 600 000 000 = 2.168 x 10^9 tonnes/year.
‘Greens’ know exactly where the catastrophe is happening, they just have to skirt around the issue.
https://micpohling.wordpress.com/2007/03/27/math-how-much-co2-is-emitted-by-human-on-earth-annually/
Oooh, I missed it;
That is only 11 million tonnes a year – less than people breath out every year (today). It did sound scary though. Catastrophe averted, NEXT…..
133 billion tonnes is carbon. Your computation is carbon dioxide. Their 11 Million tonnes a year is miniscule compared to 121 Billion tonnes a year absorbed by soil in the natural carbon cycle. Nature won’t even notice agriculture’s impact on the carbon cycle
There can’t be many places where the topsoil is 2 metres deep. In the UK, I think the average is about 60 cm.
Well when I think ‘Cat as Trophy’ two cartoons spring to mind…
http://vps.templar.co.uk/Cartoons%20and%20Politics/Fat%20Freddies%20Cat%20and%20Chairman%20MAO.png
and
http://vps.templar.co.uk/Cartoons%20and%20Politics/cat_carrier.jpg
That is an old ad for the cat carrier, it must cost twice that these days.
Originally, in MAD magazine, I think it was about $3-49.
May say something about my age . . .
Auto
Oh.
And . .
133billion tonnes of carbon [no mention of manure, I guess].
Over 60 plus million square miles – so about 2,200 tonnes per square mile.
2560000 square metres in a square mile [roughly].
So a bit less than one kilo of carbon lost, per square metre, over a period [and I note that human agriculture doesn’t use every square metre of the land masses, even today. Certainly Heathrow produces no crop.] of
“since the dawn of agriculture”
The Earth is pretty big.
Her oceans, and her land masses are pretty big.
I once flew over the ‘ears of the rabbit’ crossing Queensland, Australia.
That took two hours by 747.
Auto
Yah, but the new ones are made of plastic, instead of the more durable metal variety…
“The degradation of the Earth’s soil by humans”
That first line tells us all we need to know about the mind set of the author and likely those who did the study. There is a prevalent belief that humans are a pest on planet Earth and that anyhing we do to improve our lot in life must be harmful to nature in some way. And yet a close look at reality
would show them that crop productivity has done nothing but increase over time, the planet is greening, forrests are regrowing faster, much of what was endangered in ocean life is increasing and if CO2 continues to rise in the atmosphere we can anticipate a much greener and diverse biosphere in the future.
Spot on, Andy patullo. The proof of the pudding is in the eating (in this case even literally!) Our good, competent farmers’ soil improves every year – every year is a record harvest – so why worry?
The far-left is always randomly throwing junk against the wall to see what sticks. So far, nothing has.
Aaaaaaarrrrgggggg!
World reserves of dirt and soil is at zero!
Aaaaaaarrrrgggggg!
“I wants to make your flesh creep” the fat boy, Pickwick Papers.
Seems like the numbers are based upon estimates, not actual measurements. Where has all the carbon gone (cue Pete Seeger). It hasn’t left the planet. Perhaps it was processed through several energy cycles and converted to man-made fertilizers which cannot possibly replenish the soil. [sarc]
This is silly. 133 GT of carbon from 149 Million square kilometers of land surface (I assume that is what they speak about), is about one kilo (2.2 pounds) per two cubic meters of soil. Check me please. Of course, this is microscopic and of course it was not removed, it was moved or altered.
oh…. over 12000 years. So 1 kilo/12000 is … oh bother .08 grams per year per 2 cubic meters. right? Call me in say 50000 years please.
The soil loses carbon the same way an obese person loses weight. They lose same 5 pounds over and over again. The carbon just keeps coming back like the unwanted cat.
So ? Do these guys think plants get their carbon from the soil ? Somehow the year upon year bumper crops don’t seem to miss it .
Good point. The organic soil content is important for three reasons. 1. Retains moisture. 2. Helps earthworms maintain aeration, which in turn helps moisture retention by providing percolation channels . 3. ‘Feeds’ the bacterial microbiome, a very important aid (symbiosis, other) for roots to uptake micronutrient minerals. For intensive cultivation, the three most important elements are nitrogen (only fixed by legume symbionts), phosphorus, and potassium. Those do get depleted, hence NPK fertilizer, with ratios depending on soil and crop. Nitrogen can be replenished by legume rotation, P and K only a little by manuring. Fertilizer has nothing directly to do with soil organic (carbon) content.
And the parents sent these kids to college for an education! They’re getting dumber by the day.
It is important to realize that with or without farming (man’s intervention) carbon moves into and out of the soil constantly. Example, an untouched forest stores a lot of carbon in the wood. As the trees die naturally and are replaced by others the wood debris falls to the forest floor, rots, and is absorbed into the soil. When there the soil bacteria complete the cycle of oxidizing the carbon to CO2 where it escapes into the air to feed more plants.
If carbon is in the soil it will eventually return to the air where it came from courtesy the soil bacteria. No human intervention required. Now, is there a difference in RATE if a farmer or logger is involved – perhaps – but that question was neither studied or reported.
It’s worse than you think. Apparently, we may be running out of rocks
http://www.theonion.com/article/geologists-we-may-be-slowly-running-out-of-rocks-17341
This is too funny. Submit it as a story here Sean.
It’s my second-most favourite Onion article. Here’s my top one: http://www.theonion.com/article/son-of-a-bitch-mouse-solves-maze-researchers-spent-2432
Sean Peake … the mouse and the maze is hysterical! Thank you!
Both the mouse and the experimenters were in the wind.
“Running out of Rocks”…..Yeah, One major culprit is “landscaping” now using lotsa round ankle breakers in the curb islands in parking lots around commercial locations, including restaurants.
I live on a pile of rocks brought down from the Great White North by mile high glaciers awhile ago…
You’re welcome!
Yawn…
Anymore when I see “Carbon…,” I reach for my pistol. Paraphrasing Bismarck, or one of them fellers.
Belongs in my “Peak Science” file.
I just love how this problem is worse in pasture lands. Boy are they ever pushing the agenda.
“We developed a model’. They should have asked the farmers who work their soil for a living instead. I lived in Europe for several years and visited a relatives hog farm, one of the 25 largest in Germany at the time. Feed mostly grown on the farm. Soy, corn, oats, canola,… Farmed since about 1400 when main stone buildings were built as a monastery farm. 100 year lease from Catholic church. Soil was in great shape. Manure and stubble plowed in, regular fallowing plan. My Wisconsin dairy farm has been worked since ~1880. Only soil problem is minor hilly erosion, mostly solved by contouring. We use minimum till except on Crop rotation, and all the dairy bedding and manure goes back on the fields to build annual soil organic content. The only places where organic soil content loss is a real problem is the tropics (think Amazon forest fringes) where slash and burn is practiced, or for example Indonesia where tropical rain forest over peat bog is burned to plant oil palm for biodiesel to solve CAGW. Lunacy.
Ristvan, so you are saying the only carbon/nutrients to leave the farm is produce/livestock to feed people, no wonder the greens don’t like farmers.
In all seriousness, I have hiked/canoed a many lake/forests. If you stop to listen, in many mature forest there is no sound, no movement. Go to a farm, there are birds, insects, rodents, mammals (deer, gofers, etc.) all moving around. I question, done selectively and correctly farms are good for diversity. Keep it up! My two cents.
Just to make my point, my latest hike this weekend, edging a farmers field for a few minutes the Cicada’s and other bugs were all jumping in front of me. Entering the forest, absolutely nothing but a few mosquitoes. I did see an owl, very rare, he was sitting in a tree, flew away with my noise but on the edge of an old farmers field (in disuse for decades).
Duncan, my farm has three large (>40 acre) woodlots. All have been selectively logged, most recently 30 years ago. So pretty dense and mature. One of my many ‘magic moments was stalking a doe whitetail way down in a woodlot ravine (I was disinclined to shoot given the extraction pain and that had already taken a big buck that year), looked up at an overarching oak and there was a resting great horned owl. Now you know that owl wanted me to take the doe so it could feed on the offal for days. Result, happy deer, disappointed owl, thrilled me. Nature is wonderful. We interact with it. But when you love nature, the interaction is responsible and sustainable.
I am mostly a city dweller myself but dabble all the time with nature/farms, much more so in my youth. If I was to make an observation, it is those “deplorable’s” that interact with nature the most that actually have the most respect for it. It is this oxymoron that the ivory tower preachers have failed to grasp, in the context of CO2, their naivety, we might be better for it (maybe not). At least a well kept secret….
Yep. Most life is on the edges of a forest, not the interior.
Ristvan owls rarely if ever eat offal. Bubo owls will catch and eat almost anything that moves mammals, birds, snakes, frogs, fish, crayfish, crabs, scorpions(!), even each other, but not offal. But you disappointed a lot of other creature, even those cute little tits are extremely fond of offal.
About the relative scarcity of wildlife in large blocks of old mature forest. Remember that this is a very unnatural habitat. Under normal conditions wildfire and large animals (mammoths, mastodons, gompotheres, hippopotami, rhinoceros) would ensure a mosaic habitat. And even so there is actually more wildlife than you would think, but most of it is nocturnal or way up in the treetops.
Plants need more CO2. Why would we worry about more CO2 in the atmosphere, right where it is needed.
They should stop playing with their models and get back to realwork.
Crop yields per acre are progressively increasing and have been for decades, yet we are depleting the soil via farming. Kinda counter to the concept of diminishing returns.
The typos and grammar problems are abundant in this one. There’s also this…
“…what some refer to as the “soil fertility crisis”, a problem that can be masked by the use of artificial fertilisers.”
Change “masked” to “solved” and it becomes an accurate statement.
Did these folks get paid for this?
This one is rich too…
“The degradation of the Earth’s soil by humans has been an environmental catastrophe on a similar scale to the deforestation of much of the planet, a new study suggests.”
I guess they are talking about that “environmental catastrophe” that resulted in improving agricultural yields by an order of magnitude.
Carbon..
And then there is Carcon Dioxide..
Happily mixed in one story.
Organic matter in soils, likely complex molecules containing carbon, just like wooden furniture or wooden houses. Carbon Dioxide in the atmosphere is something completely different. When is this Carbon thing going to stop? People are built from complex carbon molecules; that is probably where all that missing soil carbon went to..
This is interesting too. The thread began with an estimate of the annual Carbon exhaled by humans. Even when corrected for the masses of CO2 vs Carbon, the result is ~3/4 of a Gt. This is 8% of the reputed 9 Gt we produce annually. Small, but not insignificant.
Humans are about 20% Carbon. Average wt 60 Kg *.2=12 kilos per capita *6.6G people gives a startling 79Gt of walking, talking Carbon.
So how much longer until we reach peak soil?
When I was a boy back on the dairy farm I must have shovelled at least ten million tons of cow dung. I assume I’m not the only one who put ‘carbon’ back into the soil!
Isn’t it amazing the way these clowns can turn on a dime…one minute farm ‘waste’ is a nightmarish environment killer…the next we’re depleting it! (Where do greenies think the animal manure goes anyway?)
Link brings up author refering to 10,000 B.C. “… a world without hunan footprint.” If we peg northern glaciers as retreating at 10,000 B.C. another perspective comes into view.
It was not until around 6,000 B.C. those previosly glacial covered lands built up enough carbon to reach the level of 1,000 grams carbon/square meter. And it took until around 3,000 B.C. for the carbon content to reach a very good level.
See Fig.4 of Daves, et al. (2016) “Longterm weathering and recent N deposition control contemporary plant-soil C, N, and P”; free full text available on-line.
Since phosphorus is integral to plants I’ll highlight authors’ observation that post-glacial weathering of rocks took until 4,000 B.C. to get lots of phosphorus available. Fig. 6 shows
a phosphorus peak around 3,000 B.C. that was already going down by 1,000 B.C.
I love it when Neanderthals lecture us. It feels so yesterday.
Oh boy, here we go. A global-warming alarmist with “machine learning-based model”. Time to fasten your scientific seat belts.
I live in Manassas, Virginia, the virtual centroid of the Civil War. Every once in a while, I run across internet pages that show pictures of “then and now.” A few times, recently, I came across pictures of Civil War battlefields then and now. What struck me immediately is the fact that “then” (in the 1860s), the landscape was almost completely devoid of vegetation. Today, it is covered with thick forest. I live on a 5 acre plot which is mostly woods, much of it ancient beech trees. But much of it is also new. I find it difficult to believe that the last century saw anything except a strong resurgence of plant life in America.
So…degradation of soils leads to increased Earth greening and higher productivity, since that is indeed the real observation. Okee dokee!