The phrase "appreciable change" means a noticeable or significant difference.
Sentences with «appreciable change»
In the A2 emissions scenario, roughly 37 % of extant ecosystems reveal appreciable changes by 2100. (ipcc.ch)
The dealer changed both lamps with a variant on payment, still not much appreciable change. (auto.ndtv.com)
Still other scientists insist that their data do not show appreciable changes in average temperature anywhere over the course of the interval. (britannica.com)