The seas are warming and more

According to an article in the Guardian:

"Although there’s some uncertainty in the distribution among Earth’s ocean basins, there’s no question that the ocean is heating rapidly."

And from Nature:

"Revised tallies confirm that the rate of sea-level rise is accelerating as the Earth warms and ice sheets thaw."

And from the BBC:

"Scientists are "very worried" that the melting of the Greenland ice sheet could accelerate and raise sea levels more than expected.
They say warmer conditions are encouraging algae to grow and darken the surface.
Dark ice absorbs more solar radiation than clean white ice so warms up and melts more rapidly.
Currently the Greenland ice sheet is adding up to 1mm a year to the rise in the global average level of the oceans."

Note - this darkening of the ice is not a major problem as yet.