Statistical analysis of the raw data on Global Warming suffers from two major pitfalls :-
1. You are looking at the combined effects from several causative sources. Unless you have the means to distinguish the various factors, you cannot apply statistical techniques to the data and expect to get anything truly meaningful out. All that can be said, at best, is, “The Globe. Still Warming.”, as the warming trend over a long enough period of time has managed to stand out over the short-term variations.
2. Looking at the data purely by eye, some of the warming or cooling effects are clearly short-term, others longer-term; so picking a range of years/months/seasons at random, or according to some bias, is likely to distort the analysis. This is known as “cherry-picking”. The results of cherry-picking include the fallacious and discredited claim that, “Global Warming stopped in 1998”, or the much more crafty and misleading, “There has been no statistically significant Global Warming since 1998”.
Some researchers are content just to point to the overall effect of the raw data – global temperatures on land and at sea are rising sharply and the charts should be sufficient to understand the basic problem.
However, some people still contest that Global Warming is taking place, or that if it is, it isn’t serious. This then, is the cue to do an in-depth analysis into the known factors in global temperatures, and to attempt to “deduct” obvious short-term warming and cooling features in order to eyeball the underlying trends :-
The BBC puts the blame on Climate Change – almost – in a report on the Russian heatwave-wildfire disaster.
But they just can’t bring themselves to admit it as an organisation – and put the claims into the mouths of others – using quotation marks in the headline (‘partly to blame’) and ascribing the opinion to “researchers”, the “UK Met Office” and “experts” :-
“10 August 2010 : Climate change ‘partly to blame’ for sweltering Moscow : By Katia Moskvitch : Science reporter, BBC News : Global climate change is partly to blame for the abnormally hot and dry weather in Moscow, cloaked in a haze of smoke from wildfires, say researchers. The UK Met Office said there are likely to be more extreme high temperatures in the future. Experts from the environmental group WWF Russia have also linked climate change and hot weather to raging wildfires around the Russian capital. Meteorologists say severe conditions may linger for several more days…”
Well, I’ve got a bit of a question to pose – it might not be possible to ascribe the current weather conditions in Russia (and Pakistan and China and and and…) to Climate Change, statistically. I mean no one weather event can be said to have been caused 100% by Climate Change. But would these extreme weather events have happened without Climate Change ?
That is by far the most important question to ask, and Michael Tobis does just that :-
“…Are the current events in Russia “because of” “global warming”? To put the question in slightly more formal terms, are we now looking at something that is no longer a “loading the dice” situation but is a “this would, practically certainly, not have happened without human interference” situation? Can we phrase it more formally? “Is the average time between persistent anomalies on this scale anywhere on earth in the undisturbed holocene climate much greater than a human lifetime?” In other words, is this so weird we would NEVER expect to see it at all?…”