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Positive Weather Solutions - Challenge to Climate Change
PWS are of the firm belief that global warming is cyclical, and there is no substantial, conclusive evidence, to back up the statement that we are heading towards a 'runaway climate' scenario.
There is significant evidence to suggest the our climate is dominated by cyclical patterns.
The graph depicts analysis of tree ring data taken from 12 locations in the northern hemisphere, and despite challenges to it from some quarters, it remains in the belief of PWS, solid evidence of a cyclical pattern in weather, and furthermore, shows that humans and their related events in history do indeed coincide with variances.  Even if the ring data as some suggest actually suggests cooling where there is warming, this too remains a variance, and not an over all definitive trend.
There is also a noticeable blip in the argument for climate change during the period from around 5000 - 3000 BC, known as the 'climatic optimum', where temperatures were even warmer than the allegedly runaway climate temperatures of the future, that we're supposed to be seeing if global warming were true. 
Furthermore, the most reliable form of temperature measurement are satellite readings taken from the Earth's lower troposphere, and these show no apparent global warming over the last quarter of a century.  Land based temperature readings are distorted, because of human influence, industry etc.
In conclusion, there have been three noticeable trend indicators in history as we understand it.  The 'Medieval Climate Anomaly'; 'The Little Ice Age', and 'The Industrial Era', which have all 'affected' the climate.  However, nature and the Earth in general has re balanced affairs as it ages, and whereas man has had an influence on the climate, there remains no outright conclusive evidence that within the next hundred year or so, temperatures will continue to climb and even if they do, they will plateau out, and cool down again.
Jonathan Powell
Senior Weather Forecaster
Positive Weather Solutions
Monday December 7th 2009