Satellite observations show sea levels rising

The paper: http://www.pnas.org/content/early/2018/02/06/1717312115

TOPEX corrections: http://onlinelibrary.wiley.com/doi/10.1002/2017JC013090/full

25 years might be too short.

This is significant because:

"... scientists now have observed evidence validating climate model projections, as well as providing policy-makers with a "data-driven assessment of sea level change that does not depend on the climate models ..."

In other words, this is the validation of the predictive ability of climate models that skeptical folks like myself have long been demanding.

At least as far as sea level rises go, we finally have a solid basis for cost - benefit evaluation of emissions control policy.

This study is a linear or at most a power model.

Glacier melting is likely to be extremely nonlinear because of physical reasons. Once a "cork in the wine bottle" gatekeeper glacier in a narrow sound in Antarctica or Greenland melts, we can have meters of sea level rise from that glacier alone. And there are multiple such glaciers.