Evidence of Earth's Warming

Is there evidence that Earth has already warmed (other than atmospheric temperature)?
Skeptic Claim to Debunk: There is not enough evidence that Earth is already warming.

Skeptics’ Sub-claims:

  • Arctic ice melt is a natural cycle.
  • Antarctica and Greenland are gaining ice.
  • Glaciers are growing.
  • Arctic ice melt is a natural cycle.
  • Sea level rise is exaggerated.
Core Science Concepts Needed to Understand the Argument:
Observed impacts (global mean temperature increase, land and sea ice melt, sea level rise, changes to the hydrologic cycle and extreme weather events, ocean acidification)