Okay, help me out here. I also read that parts of Antarctic ice sheet are getting thicker, not thinner. But what does that say about global temprature trends?

It would appear that making ice requires water and in order to get airborne water vapor to Antarctica it has to be evaporated into the air. The rate of evaporation increases as temperatures rise, not when they fall. Cooler air can carry less water vapor than warmer air.

One might expect increased thickness in the ice sheet—below the melting point of course—to be an indication that the atmosphere is carrying more water vapor; ergo, is becoming warmer on average.

      - Mark