[A]lmost all the surface temperature warming adjustments cool past temperatures and warm more current records, increasing the warming trend, according to the study’s authors.
“Nearly all of the warming they are now showing are in the adjustments,” Meteorologist Joe D’Aleo, a study co-author, told The Daily Caller News Foundation in an interview. “Each dataset pushed down the 1940s warming and pushed up the current warming.”One of the primary reasons I'm skeptical is the constant trend of cooking the data.
For an interesting corollary, read the following. Per the American Thinker, this trickery probably didn't start or stop at Michael Mann's "hockey stick":
Mann is the Penn State climatologist famous for inventing the "hockey stick" graph promoting the notion that planetary temperatures spiked in the 20th century after a Golden Age of stasis. This graph was misleading at a minimum, the product of what Phil Jones, director of the Climate Research Unit of East Anglia termed "Mike's Nature trick" to "hide the decline." What Mann did was splice two separate data sets together to create the illusion of spiking temperatures; the graph spliced data sets together without differentiation, hiding the global temperature "decline" shown by the Briffa reconstruction set.When your case is open-and-shut, you don't need to manipulate the facts.