"scientific consensus" I am very troubled by this phrase -- it's almost an oxymoron. Science is not democratic, and scientists aren't anointed arbiters of facts. Anyone can be a scientist simply by following the scientific method and collecting data in good faith; and a lone outsider with new data can challenge 100 years of "consensus". Obviously they are subject to challenges themselves, or if it's unlikely enough t…
> think tanks I'm not sure what you think a think tank is, but they're basically either (a) PR organisations, especially the ones with opaque funding or (b) some guy with a letterhead and skill at getting articles published. They certainly aren't impartial in any way. I'd much prefer my policy research to be done by civil service bodies which might at least nominally be impartial. I don't think it's feasible to impos…
Like who, specifically?
"If scientists think that something is both true and important, then why should they not speak up about it?"
Scientists agreeing about something would be a "consensus among scientists" not a "scientific consensus".
The latter implies that the consensus itself is scientific, but a consensus is never scientific. The former is still problematic, because scientists are not an anointed class, but it at least assigns some agency and allows questions like "which scientists" (to which the answer is probably "whoever we found at the major universities").
But sure, speak up about the science and what you know and what you have studied. If you want to raise an alarm, do so, but don't speak on behalf of all scientists, and don't claim that the "consensus" itself is scientific.