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Actually, the polar ice cap is floating sea ice, and has no impact on sea level rise, other than a slight bit from thermal expansion as it warms more when not frozen. Land based ice has a direct impact on sea level rise, sea ice doesn't. Loss of polar ice does have a significant impact on the Earth's albedo, creating a negative feedback, but that wasn't the point of the post.
Greenland certainly has an impact, and if it were to melt completely, then yes, it will raise sea level ~7m. However, that won't happen in 5-7 years. 200-400yr is more likely, IF it were to completely collapse. The more likely forecast is 1+m by 2100. Still significant if you live in Boston, New York etc... much more so if you live in the Florida Keys.
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