An ice cube in water (or whiskey) displaces it's own volume, hence when the ice cube melts, the level in the glass stays the same. But if you put the ice cube in another glass, let it melt, and then pour it into the whiskey glass, the volume increases

Simple arithmetic.

The ice on land is like the ice cube in its own glass before it's poured into the whiskey. Rush Limbaugh used that argument a few years ago. It was bogus then, and reality hasn't changed that much since then. Still bogus.

Don Firth