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Quote:

Originally Posted by Walshy (Post 431046)

Right so you'll admit then that we live in a complex system with checks and balances, which when roughly measured is of a slow fluctation over the course of millenia's. There are lot's of factors to measure into said cooling and raising of tempratures. It's far too complex for a fluid dynamics model. We have had cooling and raising of tempratures before and we will have them when we're no longer here on this planet as a species. The climate is rising from the the last "mini ice age" and will continue to warm until meets the "medieval warm period average". That the indrustrial revolution happened at the sametime of this warming has not been addressed by the so called climate experts you seem to know very well .....................................

Yes, there are lots of factors. And right now the driving factor appears to be humans. I'm quite confident that climatologists have taken "mini ice ages" and "industrialization" into consideration.

Yea but volcanoes emit clossal amounts compared to people...

http://s3.amazonaws.com/infobeautifu...s_volcanos.png

Thats 1 Volcano ^

So at first look you think - Holy ****! Those planes! Then you think, Hang on... How many active volcanoes in the world? Theres only Europe!

Quote:

Originally Posted by David Hayward (Post 431049)

Yes, there are lots of factors. And right now the driving factor appears to be humans. I'm quite confident that climatologists have taken "mini ice ages" and "industrialization" into consideration.

Right where is your evidence .....................................

Quote:

Originally Posted by David Hayward (Post 431040)

Volcanoes can pump huge amounts of CO2 into the atmosphere. They can also cool the planet in the short term by blasting lots of dust into the air.

Average annual CO2 from volcanos is only about 1% of what humans generate globally for CO2. While volcanos can certainly spew lots of stuff into the air when erupting, normally they are insignificant compared to human CO2 made output. CO2 from ice cores indicates a massive increase of atmospheric CO2 levels that coincide with the industrial revolution. This indicates almost certainly that human pertroleum use is responseable.

How many active volcanoes in the world?

Quote:

The answer to this common question depends upon use of the word "active." At least 20 volcanoes will probably be erupting as you read these words (Italy's Stromboli, for example, has been erupting for more than a thousand years); roughly 60 erupted each year through the 1990s; 154 in the full decade 1990-1999 (doesnt add up - Farber); about 550 have had historically documented eruptions; about 1300 (and perhaps more than 1500) have erupted in the Holocene (past 10,000 years); and some estimates of young seafloor volcanoes exceed a million. Because dormant intervals between major eruptions at a single volcano may last hundreds to thousands of years, dwarfing the relatively short historical record in many regions, it is misleading to restrict usage of "active volcano" to recorded human memories: we prefer to add another identifying word (e.g. "historically active" or "Holocene volcano").

The definition of "volcano" is as important in answering the number question as the definition of "active." Usage has varied widely, with "volcano" applied to individual vents, measured in meters, through volcanic edifices measured in tens of kilometers, to volcanic fields measured in hundreds of kilometers. We have tended toward the broader definition in our compilations, allowing the record of a single large plumbing system to be viewed as a whole, but this approach often requires careful work in field and laboratory to establish the integrity of a group's common magmatic link. The problem is particularly difficult in Iceland, where eruptions separated by many tens of kilometers along a single rift may share the same magmatic system. A "volcanic field," such as Mexico's Michoacán-Guanajuato field (comprising nearly 1,400 cinder cones, maars, and shield volcanoes derived from a single magmatic system, dotting a 200 x 250 km area) may be counted the same as a single volcanic edifice. Perhaps the most honest answer to the number question is that we do not really have an accurate count of the world's volcanoes, but that there are at least a thousand identified magma systems--on land alone--likely to erupt in the future.
How many active volcanoes known?
Erupting now: perhaps 20
Each year: 50-70
Each decade: about 160
Historical eruptions: about 550
Known Holocene eruptions (last 10,000 years): about 1300
Known (and possible) Holocene eruptions: about 1500

From some website - http://www.volcano.si.edu/faq/index.cfm?faq=03

The only thing I can think of is when they say each year they meean a vent on a volcano and when the say each decade they mean a magmatically connected system having eruptions from any of its vent - hence the number is smaller. However I am only guessing. Also I speculate the reason 20 are errupting "as we read" is because some never really stop, like - Stromboli

Quote:

Originally Posted by 5./JG27.Farber (Post 431057)

How many active volcanoes in the world?

From some website - http://www.volcano.si.edu/faq/index.cfm?faq=03

The SO2 from volcanos probably does more damage than the trivial amounts of CO2 they release.

I agree that the earth appears to be warming, however there is no data that proves it is. There is also currently no way to use what information we have to predict the future climate of the planet.

Burt Rutan puts over a good case:

http://wattsupwiththat.com/2009/08/1...imate-skeptic/

RedToo.

Quote:

Originally Posted by David Hayward (Post 431026)

There are lots of natural reasons for warm and cold periods. There are changes in solar activity, there is volcanic activity, and there are also changes in sea currents. Right now the heating appears to be the result of humans. At least that's what the scientists are saying.

My understanding is that we're due an ice age, and human activity is merely putting it off, if human activity is making any difference whatsoever, and that hasn't been determined. Eco stuff makes great news but get into the detail and nothing is proven yet.

I'm all for global warming and melting ice caps. By the time it's finished my house on a hill will be by the beach!

Hood

we live in a world of air conditioning from the mid 70's
normal summer is now global warming to us

Quote:

Originally Posted by RedToo (Post 431059)

Quote:

Originally Posted by Oldschool61 (Post 431058)

The SO2 from volcanos probably does more damage than the trivial amounts of CO2 they release.

This is by far worse! You cant breath SO2 but you breath CO2 everyday.