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These examples illustrate that different climate changes in the past had different causes. The fact that natural factors caused climate changes in the past does not mean that the current climate change is natural. By analogy, the fact that forest fires have long been caused naturally by lightning strikes does not mean that fires cannot also be caused by a careless camper.
originally posted by: D8Tee
NO, you are confused, read again what the IPCC has stated, your reference to Non-Linear technology is baffling, where did you pull that from? There is no need for interpretation, it's quite straightforward.
originally posted by: Kashai
a reply to: D8Tee
By that you mean Chaos theory and access to Non-Linear technology
The climate system is a coupled non-linear chaotic system, and therefore the long-term prediction of future climate states is not possible.
The Earth's climate: a non-linear dynamical system
What is a dynamical system?
Dynamics is the branch of mechanics that is concerned with the effects of forces on the motion of objects (from Wikipedia). More generally, it could be defined as the study of changes, therefore applying to anything that does not stay constant. This is virtually everything. Climate is one such example.
What does non-linear mean?
Even if you ignore everything about quantum physics and relativity, you probably know that the world is more complicated than even quirky physicists would like it to be. In fact, "complex" behavior (what quirky physicists call "interesting") can occur in systems than follow the deceitfully simple laws of classical mechanics, which have been set out in 1687 by Isaac Newton.
In mechanical systems, such as the ocean and the atmosphere, the richness of behavior stems from a mathematical property called nonlinearity, which can lead to chaos. Essentially, a linear system is one where doubling the perturbation doubles the response. For example, if I have spring and I pull on it slightly (a small distance x on the figure below), it will undergo oscillations that are nice and regular.
This model is extremely famous and it explained is great detail in many places ( here for pretty pictures, here for an illuminating tutorial, or here again). It was set out by Edward Lorenz, and MIT meteorologist, in a pioneering paper called "Deterministic non-periodic flow" (1963), more commonly known by its nickname, the Butterfly effect.
Lorenz's model is a very simplified model of atmospheric convection, which is a system where temperature and fluid motion interact very non-linearly: one feedbacks on the other. If the system is described by 3 variables W, T1 and T2 (see here for what they mean), then for a sufficiently high parameter (named the Rayleigh number), the system exhibits oscillations that are not periodic, hence hard to predict.
Lorenz was interested in the predictability of the solutions to hydrodynamics equations. He was a meteorologist studying weather forecasting—and the question of the fundamental limitations to this endeavor. The model he introduced  can be thought of as a gross simpliﬁcation of one feature of the atmosphere, namely the ﬂuid motion driven by thermal buoyancy known as convection, although his originalpaperseemstousethemodelsimplyasasetofequations“whosesolutions afford the simplest example of a deterministic nonperiodic ﬂow of which the writer is aware”.
On Wednesday night, Palmer will explain in a lecture titled, “Climate Change, Chaos and Inexact Computing,” why he believes physics can unlock the weather pattens that climate change will bring — and why chaos theory debunks the skepticism surrounding global warming. (The lecture will be broadcast live here at 7 p.m. EST).
The IPCC and Michael Mann have attempted to discredit a Global Medieval Warming period, they have renamed it a Medieval Climate Anomaly and published a paper that said it was regional not global. Their paper relies on a small number of proxy data sites as evidence and has been called into question by other researchers paper and evidence of Paleo Climatology like you have mentioned, tree stumps under glaciers and so on.
I recently looked up the ethnic makeup of Finland....just out of curiosity.
Apparently, 7000 years ago, Finland was covered with forests and was much warmer than today, with little amount of ice and snow.
We know 6000 years ago much of the Sahara was a lush forest area.
We know 2000 years ago, during the Roman and civilisation expansion, there was a warming period in Europe (not sure of the rest of the World).
originally posted by: D8Tee
a reply to: AndyMayhew
Source? Cause I've seen that April is cold....
Sorry, but this is utter rubbish. 2017 is so far the 2nd warmest year on record.
Global temperatures have dropped 0.5° Celsius in April according to Dr. Ryan Maue. In the Northern Hemisphere they plunged a massive 1°C . As the record 2015/16 El Nino levels off, the global warming hiatus aka “the pause” is back with a vengeance.
Africa had its 4th warmest April on record; Asia, its 8th; North America tied for its 10th; South America, its 12th; Europe, its 36th; and Oceania tied for its 40th.