In this article from the Wall Street Journal, the sad consequences on public policy when science is supressed are examined.
“Few people understand the real significance of Climategate, the now-famous hacking of emails from the University of East Anglia Climatic Research Unit (CRU). Most see the contents as demonstrating some arbitrary manipulating of various climate data sources in order to fit preconceived hypotheses (true), or as stonewalling and requesting colleagues to destroy emails to the United Nations Intergovernmental Panel on Climate Change (IPCC) in the face of potential or actual Freedom of Information requests (also true).
“But there's something much, much worse going on—a silencing of climate scientists, akin to filtering what goes in the bible, that will have consequences for public policy, including the Environmental Protection Agency's (EPA) recent categorization of carbon dioxide as a "pollutant."
“The bible I'm referring to, of course, is the refereed scientific literature. It's our canon, and it's all we have really had to go on in climate science (until the Internet has so rudely interrupted). When scientists make putative compendia of that literature, such as is done by the U.N. climate change panel every six years, the writers assume that the peer-reviewed literature is a true and unbiased sample of the state of climate science.
“That can no longer be the case. The alliance of scientists at East Anglia, Penn State and the University Corporation for Atmospheric Research (in Boulder, Colo.) has done its best to bias it.
“A refereed journal, Climate Research, published two particular papers that offended Michael Mann of Penn State and Tom Wigley of the University Corporation for Atmospheric Research. One of the papers, published in 2003 by Willie Soon and Sallie Baliunas (of the Harvard-Smithsonian Center for Astrophysics), was a meta-analysis of dozens of "paleoclimate" studies that extended back 1,000 years. They concluded that 20th-century temperatures could not confidently be considered to be warmer than those indicated at the beginning of the last millennium.
“In fact, that period, known as the "Medieval Warm Period" (MWP), was generally considered warmer than the 20th century in climate textbooks and climate compendia, including those in the 1990s from the IPCC.
“Then, in 1999, Mr. Mann published his famous "hockey stick" article in Geophysical Research Letters (GRL), which, through the magic of multivariate statistics and questionable data weighting, wiped out both the Medieval Warm Period and the subsequent "Little Ice Age" (a cold period from the late 16th century to the mid-19th century), leaving only the 20th-century warming as an anomaly of note.”