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The Milankovitch cycle associated with positive/negative feedback loops, most importantly albedo change and methane. The problem now is that according to these natural cycles we should be cooling but...the opposite is occuring and it is accelerating and the 12 degree temp rises you describe show what is possible once the feedback loops really get going
Despite the scepticism fueled by vested interests, I have personally stopped flying, try to mend rather than replace, gone all but vegetarian, changed energy to 100% renewable and deinvested pension from anything to do with fossil fuels. This has saved me/made me quite a lot better off. I fail to understand why more people are not taking actions, if only for financial reasons.
This is a good link: WWF Footprint Calculator
Try it and post on here, how you are doing. I am at 9 tonnes p/a...85% of 2020 target
Hi Bann Special
Sorry I must have missed something. If you re-read, my question was about how temperatures went up 12 degrees, were stable, then went down 12 degrees (with associated sea level range change of 12m). All within +/-1,000 years and in the absence of humans (industrialised or not). Milankhovitch cycles acting on long timeframes (100ka, 40ka, 23ka) don't seemingly explain that, do they? Even Summerhayes in Earth's Climate Evolution does not grasp that nettle and admits there are many other potential issues. Speaking of which I'll have to see if I can post one of the images from that (pending copyright issues) so we can see the "Hockey Stick Illusion" has a historical precedent. And, err, whilst these things happen, and will be a major logistic issue, they happen naturally and cannot be geoengineered out of. No mind.
As for the carbon footprint guesstimate, I'm actually on 72% and 7.8tonnes, but that's also mainly because of a lack of flights this year. Maybe it just means the questions are bunk
I could easily improve it by shooting the dog, but I'd rather improve it by killing more of my line-caught salmon for the table and eating more shot venison and other game etc. (both much more sustainable than mass produced food of any type) rather than go veggie again (I was one, and part time vegan for over 10 years when young and dafter) as that necessitates converting swathes of river banks to silt-run off fields and intensification of fertilisation to add to the degradation of salmon habitat...