Ah but how about this for a new list?
1 Arctic - North Pole
2 Arctic - Gunnbjørnsfjell
3 Antarctic - South Pole
4 Antarctic - Vinson
5 Highest Point on Earth - Everest
6 Farthest Point from the Earth's core and nearest point to the sun - Chimborazo
7 Harry's House - Lowest point on the planet

Actually i mean the Dead Sea is the lowest point on earth... not much of a climb though
(Well 1 to 6 anyway)
Oh and by the way, Greenland is a self-governing overseas administrative division of the Kingdom of Denmark but it's on the North American tectonic plate so is part of the American continent
Actually there are around 14 major tectonic plates - we could create another list but what would be the point? I think the origininal seven summits right or wrong would always outshine it simply because of the way it showed how ordinary people could climb ANYWHERE if they really wanted to. That's the real significance of the seven summits