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Current sea level rise is after all not exaggerated, in fact the opposite case is more plausible.

Observational data and changing conditions in such places as Greenland suggest if there's a real problem here it's underestimation of future sea level rise.

Various technical criticisms are mounted against satellite altimeter measurements by skeptics.

Indeed, deriving millimeter-level accuracy from orbit is a stunning technical feat so it's not hard to understand why some people find such an accomplishment unbelievable.

Other skeptic arguments about sea level concern the validity of observations, obtained via tide gauges and more recently satellite altimeter observations.

Tide gauges must take into account changes in the height of land itself caused by local geologic processes, a favorite distraction for skeptics to highlight.

In point of fact, observed sea level rise is already above IPCC projections and strongly hints at acceleration while at the same time it appears the mass balance of continental ice envisioned by the IPCC is overly optimistic (Rahmstorf 2010 ).

Bioturbation is defined as the reworking of soils and sediments by animals or plants.

These include burrowing, ingestion and defecation of sediment grains.

All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Around 1990 it became obvious the local tide-gauge did not agree - there was no evidence of 'sinking.' So scientists at Flinders University, Adelaide, set up new, modern, tide-gauges in 12 Pacific islands.

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Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. Gavin Schmidt investigated the claim that tide gauges on islands in the Pacific Ocean show no sea level rise and found that the data show a rising sea level trend at every single station. Sea level rises as ice on land melts and as warming ocean waters expand.

For example, termites (Macrotermes bellicosus) burrow and create mounds that have a complex system of air ducts and evaporation devices that create a suitable microclimate in an unfavorable physical environment.