Ice melt tipping point process.

Graphic of the ice melt tipping point process eg for Arctic sea ice which is floating on water.  In Greenland and Antarctica most of the ice on rock.

The top diagram represents four fifths of the sun reflected back by the ice (ice albedo is at least 80% reflection) and one fifth hitting the sea and being absorbed (sea water albedo is 20% or less so it absorbs at least 80% of sunlight). 

 Next diagram  -global warming of the sea melts some ice so three fifths are reflected and two fifth warm the sea.  The process is now accelerating rapidly because the more the ice melts the more sea is exposed and absorbs the sunlight.

Next diagram - Only one fifth of the sunlight is reflected.;  Four fifths are absorbed so the acceleration increases very fast to the final stage shown in the last diagram.