There are 5 major sources of global temperature data which are most often referred to. Three of them are estimates of surface temperature, from NASA GISS (Goddard Institute for Space Studies), HadCRU (Hadley Centre/Climate Research Unit in the U.K.), and NCDC (National Climate Data Center). The other two are estimates of lower-troposphere temperature, from RSS (Remote Sensing Systems) and UAH (Univ. of Alabama at Huntsville). All are anomaly data, i.e., the difference between temperature at a given time and that during a baseline period. They tend not to be on the same baseline; for GISS the baseline is 1951 to 1980, for HadCRU it’s 1961 to 1990, for NCDC it’s the 20th century, and for satellite data the baseline is 1979 to 1999. Since they use different baselines, they’re on a different scale, i.e., each has its own zero point for temperature. To compare them, we need to use the same zero point for all.
I didn't realize that Celsius is a flexible scale. Turns out that zero for temperature, changes based on the location on earth and who is producing the data. There are baselines and anomalies that must be manipulated, indexed and massaged before it can be released for general consumption. Note that all the data sets are comprised of estimates of surface and air data. A synonym for estimate is "guess". Berkeley has datasets but only release the ones that they have manipulated. Why can the public not have access to the raw data? Probably for the same reason that Hillary hides her email.
If you want people to accept AGW, make the data available, straight from the sensors and thermometers. Until then, it looks like a scam to extract more money from the masses. Fuel in CA is $1 a gallon more than the rest of the country, thanks to cap and trade. Cap and trade is merely a scheme to remove more money from the working man's wallet and put it in the coffers for big business and government. When traffic lights are synchronized, and the US gets serious about public transportation, then I will believe that we have a carbon problem and that the government is actively doing something to reduce it.
FYI, I drive electric cars and have solar panels. It makes good economic sense. It also helps insulate me from the idiots who keep raising the costs of living.