Okay. Greenland isn't the whole world. Maybe some ice melted in Greenland. That doesn't mean the whole world has warmed up. So it's not "global warming", it's "some ice melted in Greenland".

Secondly, just because some ice melted in Greenland doesn't prove that the "global warming theory" is correct. Ice melted in Greenland well before the Industrial Revolution, that's why it's called "Greenland". Vikings used to live there, raise cattle, and grow crops. You can't raise cattle or grow crops on a sheet of ice.

There might well be some OTHER reason for Greenland ice melting than "people released carbon dioxide, that warmed up the whole planet to warm up, and melted the ice in Greenland". Maybe it's as simple as "there was a big ice age which ended a few thousand years ago, and since then the planet has been warming up". But saying something like that is considered HERESY in the Church of Global Warming, so that's why you don't hear people saying it much.