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 a disastrous impact 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, according to a study published in the journal Nature. The effect of meltwater on global ocean circulation 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.