Antarctic sea ice extent has been at record lows for most of the past year. For the last week or two, it is second behind the lows of 2016.
One would have to read the article to understand this, but the current issue is that "fast ice", that is sea ice which has been attached to a shore line for a long time has come loose and is being blown out of the Arctic into shipping lanes where ice is not normally found this time of year. This is happening because the Arctic was exceptionally warm (for the Arctic) this past winter. This ice which is many years old is moving to warmer waters and will inevitably melt.
The iceberg the Titanic hit was probably calved from a glacier in West Greenland. There's more of that going on than there was 100 years ago, but this is not the same thing.
Attribution is an active area of climate research and has been for a long time. The greenhouse gas theory originated almost 200 years ago and there is no reasonable doubt that human activity has significantly changed the atmospheric greenhouse gas composition. Thus any plausible alternative to anthropogenic climate change theory would have to have to explain why a significant increase in greenhouse gas doesn't affecting climate and would have to propose an alternative explanation for recent warming consistent with observations.