All committee members serve without pay. NASEM itself does not perform original research; rather it provides independent advice. Federal agencies are the primary financial sponsors of the Academies' work; additional studies are funded by state agencies, foundations, other private sponsors, and the National Academies endowment. The external sponsors have no control over the conduct or results of a study, once the statement of task and budget are finalized. Study committees gather information from many sources in public meetings but deliberate in private in order to avoid political, special interest, and sponsor influence. All reports go through an extensive external review facilitated by the internal Report Review Committee (also consisting of members from the NAS, NAE, and NAM). Through this study process, the National Academies produce around 200 reports each year. Recent reports cover such topics as addressing the obesity epidemic, the use of forensics in the courtroom, invasive plants, pollinator collapse, underage drinking, the Hubble Telescope, vaccine safety, the hydrogen economy, transportation safety, climate change, and homeland security. Many reports influence policy decisions; some are instrumental in enabling new research programs; others provide independent program reviews. The National Academies Press is the publisher for the National Academies of Sciences, Engineering, and Medicine, and makes its publications available for free online reading, and the full book PDFs have been available for free download since 2011. Notable reports Reports on climate change In 2001, the NRC published the report Climate Change Science: An Analysis of Some Key Questions, which emphasized the fact that national policy decisions made now and in the long-term future will influence the extent of any damage suffered by vulnerable human populations and ecosystems later in this century. The report endorsed findings of the Intergovernmental Panel on Climate Change (IPCC) as representing the views of the scientific community: The changes observed over the last several decades are likely mostly due to human activities, but we cannot rule out that some significant part of these changes is also a reflection of natural variability. Human-induced warming and associated sea level rise are expected to continue through the 21st century ... The IPCC's conclusion that most of the observed warming of the last 50 years is likely to have been due to the increase in greenhouse gas concentrations accurately reflects the current thinking of the scientific community on this issue. In 2013, the NRC published the report Abrupt Impacts of Climate Change: