"Dylan Smith" wrote in message
...
On 2006-07-03, Matt Barrow wrote:

"Dylan Smith" wrote in message
...
On 2006-07-01, Matt Barrow wrote:
1) What percentage of annual CO2 production is human caused and what
portion
is natural?

Human production is around 3% of annual planetary CO2 production.

Very good!!

Follow-up: What is the most common greeenhouse gas and what is the
breakdown
on human vs. natural sources?

Water vapor is the most common greenhouse gas. In fact, the greenhouse
effect
is necessary for life as we know it in the first place. Without solar
energy being retained by H2O, CO2 and other gases, the Earth would quite
probably be rather frigid (although, if there was no water, it wouldn't
be icy of course!)

The human effect in the grand picture isn't that big (the Earth won't
turn into another Venus) but that's not to say that it won't be
significant.

How much is "significant? The IPCC has (IIUC) estimated human influence to
be 0.07C over the next 50 years. During the last 100 years, temps have
increased 0.25F.

It's not necessary to "destroy civilization" either to have
less effect on the atmosphere. However, there's very strong evidence
(overwhelmingly strong) that the current increase in CO2 concentrations
is caused by us.

Cite? And if your statement is correct, why did we have significant COOLING
from 1940 to 1975?

"Appearing before the Commons Committee on Environment and Sustainable
Development last year, Carleton University paleoclimatologist Professor Tim
Patterson testified, "There is no meaningful correlation between CO2 levels
and Earth's temperature over this [geologic] time frame. In fact, when CO2
levels were over ten times higher than they are now, about 450 million years
ago, the planet was in the depths of the absolute coldest period in the last
half billion years." Patterson asked the committee, "On the basis of this
evidence, how could anyone still believe that the recent relatively small
increase in CO2 levels would be the major cause of the past century's modest
warming?" http://www.canadafreepress.com/2006/harris061206.htm

And

"We are told, however that man-made carbon dioxide is the source of the
global warming problem. As Professor Essenhigh (Robert Essenhigh, Professor
of energy conservation at Ohio State University-MB) asks, "what has carbon
dioxide to do with this"?



He explains, "the two principled thermal-absorbing and thermal-emitting
compounds in the atmosphere are water and carbon dioxide. However – and this
point is continually missed – the ratio of water to carbon dioxide is
something like 30-to-1 as an average value. At the top it is something like
100-to-1. This means that the carbon dioxide is simply ‘noise’ in the water
concentration, and anything carbon dioxide could do, water has already
done." "So," he asks, "if the carbon dioxide is increasing, is it the carbon
dioxide driving the temperature or is the rising temperature driving up the
carbon dioxide"? In other words, the carbon dioxide issue is irrelevant to
the debate over global warming. "



Yes, with a rather large delay; IOW, warming CAUSES CO2.

Cite?

http://www.sierraclub.ca/national/pr...k-ice-core.jpg

Also:
http://www.columbia.edu/itc/cerc/see...ecoregraph.jpg