Interesting point. Just like a skater pulling their arms in, snow melting and running to lower ground would make the earth spin faster (and let's add in the extra erosion). Sea levels are rising though (due to both thermal expansion and runoff).
Be interesting to estimate the size of the various effects (no doubt I've missed plenty of others) but is it really true that a change in sign of the acceleration of Earth's angular velocity is down to climate change?
