The Heartland Institute has published a paper: Global Sea Level Rise; an Evaluation of the Data. The key finding is that contrary to the IPCC’s statement that it is “very likely” sea-level rise is accelerating, the highest quality coastal tide gauges from around the world show no evidence of acceleration since the 1920s.
Crucially, the paper notes:
Key findings are that at the 95% confidence level, no consistent or compelling evidence (yet) exists that recent rates of rise are higher or abnormal in the context of the historical records available across Europe, nor is there any evidence that geocentric rates of rise are above the global average. It is likely a further 20 years of data will distinguish whether recent increases are evidence of the onset of climate change–induced acceleration