Antarctic ice melt threatens global ocean currents.

Rapidly melting Antarctic ice is causing a dramatic slowdown in the flow of water through the world's oceans, which could have disastrous impacts on global climate, the marine food chain, and even the stability of ice shelves. The deep ocean water flows from the Antarctic could decline by 40% by 2050, reducing the salinity and density of the surface water and diminishing the downward flow to the sea's bottom. This effect has not yet been included in the complex models used by the IPCC to describe future climate change scenarios, but it is going to be considerable.