I've run into denalists who seriously do argue that sea levels aren't rising. They seem to base their argument on taking a sea level graph that only uses data from the ARGO floats[1], measuring it to get numbers then doing an incompetent linear regression on the result[2].


[1] Which only get you a few thousand data points a week as the floats surface to transmit.

[2] The graph starts as the ocean is entering the high portion of the cycle and ends as a low portion ends.