She wrote:
>Much of Antarctica consists of ice sheets with no ground underneath.
If the ice melts it could not only raise ocean levels but could shift ocean
circulation and weather patterns, bringing drought, severe storms and the
wider spread of tropical diseases/
Steve Lowenthal believes: "If ice sheets have "no ground underneath",
then they are floating, and if they are floating, then they are already
displacing water and impacting sea level. Ice floats because it is less
dense than water. Upon melting, the entire floating ice sheet (that
which is visible above the water line plus that submerged or below the
water line) would have a volume equal to only that of the submerged ice
block due to its increased density. So, the total embodiment of water
contained within a floating ice sheet will not displace
any additional water even after it has completely melted and
will neither impact sea level nor "raise ocean levels".
Since "much of Antarctica consists of ice sheets with no ground
underneath", then there exists relatively "little" ice with "ground
underneath". The only melting ice that can "raise ocean levels" would be
from that which is not floating. So if Maggie Fox's premises are
correct, then we should have relatively "little" to worry
about.