Comments on: Um, wait a millennium…

By: Ben James

Ben James — Mon, 06 Oct 2008 08:50:22 +0000

Yes, geological events have naturally been altering the composition of our atmosphere since the Earth was formed.

That fact doesn’t mean that humans are incapable of having a significant effect.

What if we are able to change the concentration of carbon dioxide far beyond the highest point in that graph? What will the graph mean then?

By: PostCards from the Bleeding Edge

PostCards from the Bleeding Edge — Sun, 05 Oct 2008 03:35:39 +0000

A little on climate science…

I belong to that category of anthropogenic global warming skeptic that is skeptical of all sides in the debate. A better way to put it is that I’m interested in anthropogenic and natural causes of climate change and what to do about them.

I’m dist…

By: David Taht

David Taht — Sun, 05 Oct 2008 02:52:37 +0000

I tried to post here earlier today, didn’t work.

Ended up commenting at length via
http://the-edge.blogspot.com/2008/10/little-variety-in-climate-science.html

(have also never figured out trackbacks)

Just to be snarky @ Russ, the little heat wave we had in the 900s in Central America wasn’t so good for the Mayans… and too much heat sucks the IQ right out of you.

@ Doc – the current warming coincides with the rise of industrialization. Plenty of fossil fuels were burnt during 45-79 cooling phase….

By: Richard Bennett

Richard Bennett — Sat, 04 Oct 2008 21:53:48 +0000

Wikipedia, the font of all wisdom (after the Left Behind books that Sarah loves so much) says the Little Ice Age was caused by volcanic activity and maybe sun spots: “Throughout the Little Ice Age, the world also experienced heightened volcanic activity.[26] When a volcano erupts, its ash reaches high into the atmosphere and can spread to cover the whole of Earth. This ash cloud blocks out some of the incoming solar radiation, leading to worldwide cooling that can last up to two years after an eruption. Also emitted by eruptions is sulfur in the form of SO2 gas. When this gas reaches the stratosphere, it turns into sulfuric acid particles, which reflect the sun’s rays, further reducing the amount of radiation reaching Earth’s surface. The 1815 eruption of Tambora in Indonesia blanketed the atmosphere with ash; the following year, 1816, came to be known as the Year Without A Summer, when frost and snow were reported in June and July in both New England and Northern Europe.”

Who can argue with the Wisdom of Crowds?

By: Russell Nelson

Russell Nelson — Sat, 04 Oct 2008 20:56:09 +0000

Doc, the short cycles run every 1500 years plus or minus 500 years. There’s evidence for this from all over the world (although if you ignore the evidence from the rest of the world, you can claim that these cycles only happen in Europe, although why you would do that I don’t understand). The interesting thing is that during the previous two warmings, mankind did great things.

Living in the northern part of the US, where we regularly experience -20F temperatures, and occasionally -40F, I can tell you with a 90% certainty that I’d rather be too warm than too cold.

By: Stephen Lewis

Stephen Lewis — Sat, 04 Oct 2008 13:53:05 +0000

I was going to add a comment on the economic and population effects of the “Little Ice Age” four centuries ago — dramatic falls in population and declines in economies — and contrast its possibly cyclical origins which the far greater scope and effects of present day global warming. But, no need to, the comments above already do an excellent job of showing how extreme the present situation is and how closely it coincides with the age of fossil fuels. By the way, a gallant tip-of-the-hat to Sarah Palin and her comment above.

By: Doc Searls

Doc Searls — Sat, 04 Oct 2008 11:50:40 +0000

Richard,

You’re right about cycles, or lack of them. There are short and long processes, and major events that may or may not be repeated. The recent period of pulsed glaciation may or may not be over. No way to tell without living for an impossibly long time.

But the current warming so coincides with the burning of fossil fuels that it’s irreponsible not to address the latter as an obvious cause.

My problem with Biden’s remark is really a quibble. I’m a geology freak who likes to take a long view. And I can excuse Biden for simplifying the issue in a useful way.

And Dave, yes, our currently high CO2 levels is, and should be, alarming.

By: Sarah Palin

Sarah Palin — Sat, 04 Oct 2008 02:30:15 +0000

Ya know, the earth is only 6000 years old – so all this “sciencey” stuff is just a big steaming pile of moose poo.

By: Dave

Dave — Fri, 03 Oct 2008 23:25:18 +0000

So, using that graph: wouldn’t the fact that the current CO2 levels have climbed from 320 to 380 in the last 50 years be kind of alarming, considering that your graph shows them not that high in the last 650,000 years?

By: Richard Bennett

Richard Bennett — Fri, 03 Oct 2008 23:18:52 +0000

PALIN: Yes. Well, as the nation’s only Arctic state and being the governor of that state, Alaska feels and sees impacts of climate change more so than any other state. And we know that it’s real.

I’m not one to attribute every man — activity of man to the changes in the climate. There is something to be said also for man’s activities, but also for the cyclical temperature changes on our planet.

But there are real changes going on in our climate. And I don’t want to argue about the causes. What I want to argue about is, how are we going to get there to positively affect the impacts?
———-

The thing is, Doc, the “cyclical nature of the climate” thing is actually hogwash. While we know that there have been several periods of warming and cooling in the earth’s history, we do not in fact have any reason to believe that there’s a master cycle that makes them come and go for no particular reason. In fact, the atmosphere on this planet is largely created and maintained by volcanoes and our mix of plant and animal life, and the major changes in climate are all correlated to events that altered the mix.

The early atmosphere was high in methane and low in oxygen, but the rise of cyanobacteria changed that. Meteor impacts and/or volcanoes brought about “snowball Earth” which was ultimately warmed up by gradual increases in temperature releasing greenhouse gases again. And so it goes.

The current warming period – the one that’s like 100 years old – certainly appears to be correlated to the increased use greenhouse gas-emitting fuels, and that’s what needs to be addressed.

So just to say that something has happened before is not to say that it’s “cyclical”. There has to be a regular rhythm for that to be the case.

Incidentally, Biden has heard of Hezbollah and knows that it’s controlled by Iran. That’s a good thing.