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Countering climate change sceptics

In Uncategorized on December 7, 2009 at 6:23 pm

Ok seems to me the evidence points to problems on the climate front, for some reason some people dont agree despite a lot of evidence to the contrary. So here's a handy debunker from the BBC. 

EVIDENCE THAT THE EARTH'S TEMPERATURE IS GETTING WARMER IS UNCLEAR

 

Counter- Warming is unequivocal. Ocean measurements, decreases in snow cover, reductions in Arctic sea ice, longer growing seasons, balloon measurements, boreholes and satellites all show results consistent with records from surface weather stations. The urban heat island effect is real but small; and it has been studied and corrected for. Analyses by Nasa, for example, use only rural stations to calculate trends. Research has shown that if you analyse long-term global temperature rise for windy days and calm days separately, there is no difference. If the urban heat island effect were large, you would expect to see more warming on calm days when more of the heat stays in the city. Furthermore, the pattern of warming globally doesn't resemble the pattern of urbanisation, with the greatest warming seen in the Arctic and northern high latitudes. Globally, there is a warming trend of about 0.8C since 1900, more than half of which has occurred since 1979.

 

IF THE AVERAGE TEMPERATURE WAS RISING, IT HAS NOW STOPPED

 

Counter-The year 1998 was exceptionally warm because of a strong El Nino event, while 2008 was unusually cold because of La Nina conditions. Variability from year to year is expected, and picking a specific warm year to start an analysis (or a cold one to end with) is "cherry-picking". If you start in 1997 or 1999 you will see a sharp rise. Furthermore, while the UK Met Office regards 1998 as the hottest year yet, Nasa thinks it was 2005 (they use the same data but interpret it differently). According to the Met Office, the 10 warmest years in the modern record have all occurred since 1997.

 

COMPUTER MODELS ARE NOT RELIABLE

 

Counter -Models will never be perfect and they will never be able to forecast the future exactly. However, they are tested and validated against all sorts of data. Over the last 20 years they have become able to simulate more physical, chemical and biological processes, and work on smaller spatial scales. The 2007 IPCC report produced regional climate projections in detail that would have been impossible in its 2001 assessment. All of the robust results from modelling are backed up by theoretical science or observations.

 

 CLIMATE IS MAINLY INFLUENCED BY THE SUN

 

Counter- Solar variations do affect climate, but they are not the only factor. As there has been no positive trend in any solar index since the 1960s (and a negative trend more recently), solar forcing cannot be responsible for the recent temperature trends. The difference between the solar minimum and solar maximum over the 11-year solar cycle is 10 times smaller than the effect of greenhouse gases over the same interval.

 

WATER VAPOUR IS THE MAJOR GREENHOUSE GAS; CO2 IS RELATIVELY UNIMPORTANT

 

Counter – The statement that water vapour is "98% of the greenhouse effect" is simply false. In fact, it does about 50% of the work; clouds add another 25%, with CO2 and the other greenhouse gases contributing the remaining quarter. Water vapour concentrations are increasing in response to rising temperatures, and there is evidence that this is adding to warming, for example in Europe. The fact that water vapour is a feedback is included in all climate models.

Full article with sceptic arguments included on the BBC site :Counters to Climate change

For anyone interested in the goings on at Copenhagen the New York times has a good overview: Copenhagen summit . 

Posted via email from Urban Ascetic (Lite)

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