A little confused bc water has a set melting point.
In: 3
Because there is a LOT of polar ice. It covers 14 MILLION kilometers of area. If only a tiny layer of the surface area melts, it creates warm runoff, which erodes the edges drastically.
0 C: Ice stays frozen
1 C: Ice melts
All it takes to melt ice is for it to dip just above that point and start melting. Scale that up to a size where you have hundreds and hundreds of kilometers of area covered by ice, and a bunch of areas melting a bit at once means a pretty drastic change in area being covered.
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