«I think part of the reason slow feedbacks weren't included [in previous IPCC reports] was that they were assumed to be too slow to be relevant to human - induced climate change,» said Michael Previdi, lead author of the report.
It is possible that effective climate sensitivity increases over time (ignoring, as for equilibrium sensitivity, ice sheet and other slowfeedbacks), but there is currently no model - independent reason to think that it does so.