Melt water due to global warming deforming seabed.

Source

• A Netherlands-based study has found the weight of water pouring off of Earth's melting ice sheets is causing the planet's sea floors to deform.
• Researchers found man-made changes to ocean water levels, including those generated by climate change, are "squishing" the planet.
• This is affecting measurements of sea level rise by making the results appear less alarming, the researchers noted.
  Source