The same process that reduces Arctic ice (warming), increases Antarctic ice (warming).
That is one hypothesis, and an unproven one.
The difference is that the sea ice in Antarctica comes from the land.
No, almost all of it comes from freezing seawater.
Also there is some increase in mainland ice in Antarctica due to the increased moisture in the air (also due to warming) as normally Antarctic air is dry like a desert.
Right, it never snows in Antarctica...the miles-thick sheets of ice appeared by magic. Got it.
Regardless, both places are losing ice in the long run.
That of course remains to be seen. Also be clear on sea ice versus landlocked ice. Some parts of the antarctic icecap are growing.
Adding Arctic sea-ice coverage to Antarctic sea-ice coverage to say that everything is ok is just trying to spin the facts to suit your politics.
No, it's an objective look at polar sea ice based on the only directly measurable metric. Your interpretation of that is exactly that - one interpretation. Furthermore, you should reflect (oops, bad pun) on the fact that the additional antarctic sea ice increases albedo and thus has a net cooling effect - the same argument used to say that arctic sea ice loss is increasing arctic ocean heating.
The science is quite clear.
No, the science is not clear. What is clear is the desperation of those shouting "the science is settled" while stubborn reality continues to contradict the beautiful theories and models.