Reader Phil Primeau (Defend Canada) has read the IPCC report so you don’t have to. His summary;
1. Using Data and Observations since 1970, we have witnessed evidence of a warming trend. We are between 90% and 95% certain that in the last 37 years there has been a warming trend that has caused changes such as early blossoming, changed behavior in native species etc.
2. Based on this warming trend, we are 66% confident that this is caused by man. In that 66% confidence level, we believe that if it is caused by man, we are 90% certain it is due to the rises in manmade CO2 since 1950. This is based on “models” that look at natural or external impacts and internal impacts – and the combination of both best fit what we would expect the result to be. That being said, “Limitations and gaps prevent more complete attribution of the causes of observed system responses to anthropogenic warming … the available analyses are limited in the number of systems and locations considered …. natural temperature variability is larger at the regional than the global scale, thus affecting identification of changes due to external forcing”. (In other words, we are flying by the seat of our pants on this conclusion)
3. “Nevertheless, the consistency between observed and modelled changes in several studies and the spatial agreement between significant regional warming and consistent impacts at the global scale is sufficient to conclude with high confidence that anthropogenic warming over the last three decades has had a discernible influence on many physical and biological systems.” (Despite the shortcomings in our model, and the fact we could only get 300 scientists to agree to a 66% certainty, we the editors of said document think our models are accurate, and that being said, we are going to say we are 95% confident that global warming is manmade anyways, despite lack of concensus.)
4. Other effects of regional climate changes on natural and human environments are emerging, although many are difficult to discern due to adaptation and non-climatic drivers. We are 50% sure that northern crops benefit an early spring, 50% sure that forests are more likely to be affected by wildfire and pests. We are 50% sure that heat related diseases (i.e. transferred by mosquitos) are more prevalent, and 50% sure that there are more allergens. We are alos 50% sure that warming is having a negative impact on winter sports. (Only 50% sure….really?)
5. Recent climate changes and climate variations are beginning to have effects on many other natural and human systems. However, based on the published literature, the impacts have not yet become established trends. Despite uncertainty, there may be a trend of glacial melting causing flood, there may be a trend to longer dry seasons in Africa, and there may be a trend of Coastal flooding. (all completely uncertain, because of lack of data)
6. Based on current trends, (which lack confidence and enough data to judge anything properly by our own admission) (i equate this to making a future stock price prediction based on looking at 3 months of the stock price) these are our predictions:
a) By 2050, Wet areas will get wetter by 10% – 40%. Dry areas will get drier by 10% – 30%.
b) By 2050, 20% – 30% of species will go extinct (if they don’t adapt as they have for the past billion years)
c) by 2050, 1-3 degree increase which will affect dry regions negatively and wet regions positively
d) by 2080 coast will be at risk (but we are not saying to what degree they might be affected)
e) Rich areas will get richer, poor areas poorer – mostly based on existing geo-economic situations.
It goes on….but all of the predictions are based on self admitted lack of evidence…
At Prometheus, attention is drawn to a chart correlating “weather related catastrophes compared with global temperatures”;
The Figure below is found in the IPCC WG II report, Chapter 7, supplementary material (p. 3 here in PDF). I am shocked to see such a figure in the IPCC of all places, purporting to show something meaningful and scientifically vetted. Sorry to be harsh, but this figure is neither.
I am amazed that this figure made it past review of any sort, but especially given what the broader literature on this subject actually says. I have generally been a supporter of the IPCC, but I do have to admit that if it is this sloppy and irresponsible in an area of climate change where I have expertise, why should I have confidence in the areas where I am not an expert?
Not surprisingly, competent analysts have considered these issues in detail. [….] once you normalize for population, wealth and inflation at the national level, there is a weak upward trend in normalized weather-related disaster losses only if you include the 2004 / 2005 hurricane season. The authors are explicit that that US losses dominate these numbers and that a shift in US population into more vulnerable areas in Florida probably accounts for any trend.
It took me 15 minutes on Google to find the relevant research, and maybe two hours to assimilate it. Apparently this was too much work for 2,500 scientists.
Related – The Great Global Warming Swindle is now available on DVD via Amazon(UK).












