This is just one of dozens of responses to common climate change denial arguments, which can all be found at How to Talk to a Climate Sceptic.
The Antarctic Ice sheets are actually growing, which would not be happening if Global Warming were real.
There are two distinct problems with this argument. First, any argument that tries to use a regional phenomenon to disprove a global trend is simply dead in the water. Anthropogenic global warming theory does not predict uniform warming throughout the globe. We need to assess the balance of the evidence. In the case of this particular region, there is actually very little data about the changes in the ice sheets, and the conclusions we have seen of some growth in the East Antarctic ice sheet is such a small amount, that with the uncertainty, it might be shrinking. But even this weak piece of evidence may no longer be right. Some very recent results from NASA’s GRACE experiment, measuring the gravitational pull of the massive Antarctic ice sheets, have indicated that in fact ice mass is on the whole being lost.
Secondly, the phenomenon of thickening of an ice sheet is not by itself inconsistent with warming! Such an increase in ice mass in the face of actual warming would be the result of increasing precipitation and this is fully consistent with the Antarctic in a warming world. The Antarctic is actually one of the most extreme deserts on the planet, and warmer climates tend towards more precipitation. So even if you warmed a whopping 20oC from -50oC, you would still be well below freezing and accumulating snow, not melting in the rain.
While on the subject of ice sheets, Greenland is also growing ice in the centre for the same reasons described above, but it is melting on the exterior regions, on the whole losing approximately 200 km^3 of ice annually, doubled now from just a decade ago. This is a huge amount compared to what the changes may be in the Antarctic, around three orders of magnitude larger. So in terms of sea level rise, any potential mitigation due to the East Antarctic Ice Sheet is wiped out many many times over by Greenland’s ice sheet.
“Antarctic Ice is Growing” was first published here, where you can still find the original comment thread. This updated version is also posted on the Grist website, where additional comments can be found, though the author, Coby Beck, does not monitor or respond there.