Ice caps melting.

[styley]

Hypothetically, if all the ice caps/fjords etc were to melt how much of the earth's surface would be covered in water compared to now?

[wildwood]

The average sea level would be at least 160ft higher so there would be very little land left.

Estimates of over 200ft are wrong because they are based on the present ocean area, whereas so much land would be inundated that the oceans would be much larger. It is also notable that the Antarctic continent which holds 70% of the world's fresh water would rise somewhat without ice, such is the pressure of the up to 3 miles thick ice layer.

[heathfield]

There's a website that shows present-day land maps, and allows you to enter your own sea-level rise and see the result.
Find it here.