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I seem to remember an old black and white photo of some very old piece of farm equipment (that was new at the time) that was injecting CO2 into the soil as it cultivated it. I doubt it was done to suppress yield

It is difficult to say given the rate of activities like deforestation (now this might be a genuinely bad thing).

Thus far, CO2 has risen about 30% in the time frame you mention, it will probably increase given the rate of fossil fuel consumption; so even if there's not much to see now, there may well be in the near future.

I believe major greenhouse growers use elevated CO2 levels to boost crop production.
Even pro-AGW sites accept plants will benefit (not C4 crops, which accounts for a small fraction of the total).

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Views expressed are personal opinions and are not necessarily shared by the Safe Speed campaign

Could you explain how you understand this to be the case?


On a separate note:
Is it true that the CO2 in the atmosphere is different from man-made CO2? (isotopes) I once heard that the latter was "heavier".
If so, what is the significance of this?

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Views expressed are personal opinions and are not necessarily shared by the Safe Speed campaign

I don't know if that is true but, as you surely know, different isotopes have identical chemical properties (because the chemical properties are determined by the electical characteristics of the atom which are not changed by additional neutral particles))

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When I see an adult on a bicycle, I do not despair for the future of the human race. H.G. Wells
When I see a youth in a motor car I do d.c.brown

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The world runs on oil, period. No other substance can compete when it comes to energy density, flexibility, ease of handling, ease of transportation. If oil didn’t exist we would have to invent it.”

56 years after it was decided it was needed, the Bedford Bypass is nearing completion. The last single carriageway length of it.We have the most photogenic mayor though, always being photographed doing nothing

Ta!


Within that link it is stated that man-made additions of CO2 are 11,880ppb and natural additions are 68,520ppb. I cannot find a source for this (it isn't mentioned within the link given for the first reference). Can you find a reputable source for this?

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Views expressed are personal opinions and are not necessarily shared by the Safe Speed campaign

I would imagine that "Fossil" CO2 would contain neglegable amounts of C14 so if the concentration of C14 is seen to go down as levels of atmospheric CO2 go up then one could infer that "Fossil" carbon was being introduced to the atmosphere.

However

There is no way of telling what the fossil source is or whether it is a man made one or not.

Burning fossil hydrocarbons is only one of many sources of fossil carbon.(Cement manufacture also emits large amounts of carbon to the atmosphere) and many sources are natural and beyond our controll

Decomposition of carbonate rocks by erosion and volcanic action and volcanic emissions

Natural emissions, particularly of gas, and underground fires (They are not all as a result of human activity)

See Mud Volcanos http://en.wikipedia.org/wiki/Mud_volcano

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"The road to a police state is paved with public safety legislation"

http://en.wikipedia.org/wiki/Carbon_dioxide_in_Earth%27s_atmosphere
There is ample reference available to consult at the bottom of the wiki page.

There is also a graphical representation of the sources of industrial co2 output into the atmosphere.

The 5% (less actually...a little less than 4%) comes [originally] from the IPCC assessment reports on climate change by simple arithmetic (total - manmade) Which I'm afraid you will have to look for yourself....the documents are too voluminous.

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The world runs on oil, period. No other substance can compete when it comes to energy density, flexibility, ease of handling, ease of transportation. If oil didn’t exist we would have to invent it.”

56 years after it was decided it was needed, the Bedford Bypass is nearing completion. The last single carriageway length of it.We have the most photogenic mayor though, always being photographed doing nothing

Check this out too !
A great presentation on so-called Human-Induced climate change by Prof Ian Plimer (via Alan Dale).
Here

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Safe Speed for Intelligent Road Safety through proper research, experience & guidance.

The key sentence, which you don't seem to understand, is this.
"These natural sources are nearly balanced by physical and biological processes, called natural sinks, which remove carbon dioxide from the atmosphere. For example, some carbon dioxide dissolves in sea water, and some is removed by plants during the photosynthesis"

Even if man made CO2 is only 4% of naturally occurring CO2 it is additional which disturbs the equilibrium. An analogy: if have 1000 people per hour arriving at, say, an airport check in with a capacity of 1000 per hour and there will be free flow. Increase the input to 1050 per hour and you will soon have chaos.

Water vapour though a worse gas than CO2, is also in equilibrium

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When I see an adult on a bicycle, I do not despair for the future of the human race. H.G. Wells
When I see a youth in a motor car I do d.c.brown

You may as well have said 'I promise the needle is in this decade's worth of haystacks, have a look.'
Moreover, I don't see such a reference from your source of http://www.geocraft.com/WVFossils/greenhouse_data.html for any such thing.

However, it is reasonable to accept that 5% of emissions are from man; but as DCB rightly said, the sticking points are the sinks and accumulations. Considering how long it took for CO2 levels to fall from levels far higher than today's levels (over literlly many million of years), those sinks really must be fairly weak (can only absorb so much over time).

The claim of "5% of the 380ppm of CO2 in the atmosphere ... is due to man" is difficult to reconcile with the 30% increase of CO2 during the industrial period. Your link of http://www.warwickhughes.com/icecore/ is worth testing on AGW believers.

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Views expressed are personal opinions and are not necessarily shared by the Safe Speed campaign

Of course you would have chaos at the airport.
However, the simple fact is world temperatures were not any higher when there was an order of magnitude more atmospheric CO2 than there is now; in fact there were ice ages (colder world temps, lower sea levels) with those elevated CO2 levels. This inherently makes your analogy irrelevant.
AFAIC, this huge stumbling block alone is enough to cast serious doubt on a rapidly approaching AGW "tipping point", unless the laws of physics must have changed significantly over that time?


But does the concentration of water vapour also naturally fluctuate?
The relative effect will be large even if that fluctuation is relatively small (compared to CO2).

I thought the other main emission of fossil fuel burning was water vapour? So why has this been discounted?

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Views expressed are personal opinions and are not necessarily shared by the Safe Speed campaign

..but we don't actually know whether the Earth is a 1,000pph airport or a 10,000pph airport, or even if it is an airport!

That is the problem with the models that our so-called climate "scientists" are "playing with" - it is all guesswork

mb

Very convenient for our politicians -scientists right -politicians claim the glory .
scientists wrong -scientistss get blame
In meantime -another good cause looking for donations .

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lets bring sanity back to speed limits.
Drivers are like donkeys -they respond best to a carrot, not a stick .Road safety experts are like Asses - best kept covered up ,or sat on

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The world runs on oil, period. No other substance can compete when it comes to energy density, flexibility, ease of handling, ease of transportation. If oil didn’t exist we would have to invent it.”

56 years after it was decided it was needed, the Bedford Bypass is nearing completion. The last single carriageway length of it.We have the most photogenic mayor though, always being photographed doing nothing

Steve I do wish that you would confine your replied to what I am actually saying.

I am quite agnostic on AGW. I am merely addressing the argument that because man made C)2 is only 5% of the total it can be disregarded. It cannot, though it may be doing no harm.

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When I see an adult on a bicycle, I do not despair for the future of the human race. H.G. Wells
When I see a youth in a motor car I do d.c.brown

I believe I did just that.
I refuted the analogy you gave; then based on the reasoning given I stated/repeated my own opinion on it (which I might add has never been acknowledged).
I also questioned the significance of your comment on water vapour.
Aren't these "confined" enough for you?


...
You have implied you have "belief in AGW".
Since then I have sought clarification on the said "belief", and again; at no point did you pick up on my very strong, specific and direct wording to you - until now when "belief" hasn't even hinted at for the last 6 pages?
</irony>

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Views expressed are personal opinions and are not necessarily shared by the Safe Speed campaign

Short of closing every industry in the world there is NOTHING that can be done to stop the production of, and remove the man-made element of the total atmospheric content of CO2 (something like 2.996×10.12 tonnes total).
But the reason behind the alarmist actions is nothing to do with CO2 (or any other part of the atmosphere) but more to do with green ideals.

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The world runs on oil, period. No other substance can compete when it comes to energy density, flexibility, ease of handling, ease of transportation. If oil didn’t exist we would have to invent it.”

56 years after it was decided it was needed, the Bedford Bypass is nearing completion. The last single carriageway length of it.We have the most photogenic mayor though, always being photographed doing nothing

You don't understand what "Agnostic means", if you think that there is a contradiction between being agnostic on and believing in AGW (or any other topic)

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When I see an adult on a bicycle, I do not despair for the future of the human race. H.G. Wells
When I see a youth in a motor car I do d.c.brown

A person who believes that nothing can be known concerning the existence of God ?

Or maybe " a person who believes nothing can be known concerning agw" ?

_________________
The world runs on oil, period. No other substance can compete when it comes to energy density, flexibility, ease of handling, ease of transportation. If oil didn’t exist we would have to invent it.”

56 years after it was decided it was needed, the Bedford Bypass is nearing completion. The last single carriageway length of it.We have the most photogenic mayor though, always being photographed doing nothing