The folks at the Government Accountability Project have released a report, done in conjunction with the Union of Concerned Scientists, about government interference in climate science:
• Nearly half of all respondents (46 percent of all respondents to the question) perceived or
personally experienced pressure to eliminate the words “climate change,” “global warming,”
or other similar terms from a variety of communications.
• Two in five (43 percent) perceived or personally experienced changes or edits during
review that changed the meaning of scientific findings.
• Nearly half (46 percent) perceived or personally experienced new or unusual administrative requirements that impair climaterelated work.
• One-quarter (25 percent) perceived or personally experienced situations in which
scientists have actively objected to, resigned from, or removed themselves from a project
because of pressure to change scientific findings.
• Asked to quantify the number of incidents of interference of all types, 150 scientists
(58 percent) said they had personally experienced one or more such incidents within
the past five years, for a total of at least 435 incidents of political interference.
Given that this is based on a self-selected sample (those who chose to respond) I’d shy away from arguing that the numbers are representative, but the scope of the examples is suggestive.