Since the mid 1980s, the majority of temperature stations in the United States USHCN network have been converted from Liquid in Glass (LiG)/Cotton Region Shelters (CRS) measurement instruments to maximum-minimum temperatures system (MMTS) instruments.A number of researchers have suggested that the introduction of MMTS sensors has created a strong cooling bias in maximum temperatures and a moderate warming bias in minimum temperatures, resulting in an overall cooling bias in mean temps.
So clearly there is a good reason for the adjustments.Also, why do you choose to focus on regional/short-term adjustments that increase warming trends when the long-term global adjustments reduce it?
fx - based on some lazy skimming, I get the impression you attach a lot of importance to:1) cooling trends happening in specific regions and/or over short periods of time2) the fact that climate change happens naturally, even without human activitythose are both true statements. however, neither of them contradicts AGW.the statement that the global average temperature is increasing over the long run allows for the possibility of regional or short term cooling trends. it only requires that those be outweighed by temperature increases elsewhere and/or eventually. and that what we think we're seeing.and the fact that climate change happens naturally does not rule out the possibility of human activity altering the climate, any more than the fact that fire happens naturally rules out the possibility of people starting fires.
And pretty much when you find out they are, nobody actually gives a fuck