Nothing is clear

Source by Nasa, graphics by Afp.

Antarctica’s massive ice shelves are shrinking because they are being eaten away from below by warm water, a new study finds.
Twenty ice shelves showed signs that they were melting from warm water below.
That suggests, according to a study published Wednesday in the journal Nature, that future sea levels could rise faster than many scientists have been predicting.
It seems that climate change plays an indirect role — but one that has larger repercussions than if Antarctic ice were merely melting from warmer air,

The western chunk of Antarctica is losing 23 feet of its floating ice sheet each year. Until now, scientists weren’t exactly sure how it was happening and whether or how man-made global warming might be a factor.
Changes in wind currents pushed that relatively warmer water closer to and beneath the floating ice shelves. The wind change is likely caused by a combination of factors, including natural weather variation, the ozone hole and perhaps man-made greenhouse gases and other pollutions.