Soren wrote on Nov 13
th, 2011 at 12:16pm:
No 77 - the future - 4 question marks.
http://www.bom.gov.au/info/climate/change/gallery/77.shtmlAnd look! the caption say:
"The challenge remains to understand how the complex interplay of natural and anthropogenic driving forces will impact on the earth’s climate into and beyond the 21st century.
The challange remains to understand the complexity. Great Scot! The BoM guy musta been reading my posts, no? Bloody deniers, inflitreted even the BoM.
Well I actually agree with the statement in its intended context. (the context of the other slides presented), whereas, you don't accept the other slides presented, now do you? In the context of Soren's Law - a tiny amount will have a tiny influence, and the argument that is basically paraphrased as "Global Warming? What Global Warming?", you use as a central mantra.
Now I could also apply "There is no consensus" to the whole question of biogeochemical feedbacks or amplification feedbacks such as the breakdown of methane clathrates. These could make the whole situation change very rapidly indeed, or they might not. We'll still have the central warming effect, but it could be much worse. The potential is there for the Earth's methane content to increase by a factor of 12 if some of the predictions in papers presented this year turn out to be correct. An examination of paleoclimates is quite illuminating in that respect. (An aside: Do you think that human beings could actually live in some of the Earth's past paleoclimates? )
There
are indeed big challenges ahead in understanding exactly how the warming effect will have on systems such as the Arctic
permafrost permamelt. Here is a reasonably non-technical explanation on a site I visit occasionally. You'll love the title, but not the article.:
http://themoderatevoice.com/98291/what-if-everything-you-knew-about-projected-gl...Note the following
scandalous fact:
Quote:Methane release from the not-so-perma-frost is the most dangerous amplifying feedback in the entire carbon cycle. The permafrost contains a staggering “1.5 trillion tons of frozen carbon, about twice as much carbon as contained in the atmosphere,” much of which would be released as methane. Methane is is 25 times as potent a heat-trapping gas as CO2 over a 100 year time horizon, but 72 times as potent over 20 years! The carbon is locked in a freezer in the part of the planet warming up the fastest (see “Tundra 4: Permafrost loss linked to Arctic sea ice loss“). Half the land-based permafrost would vanish by mid-century on our current emissions path (see “Tundra, Part 2: The point of no return” and below). No climate model currently incorporates the amplifying feedback from methane released by a defrosting tundra.
Why do you think that is? Do you think those dastardly scientists are trying to pull a fast one? hmmm?