Cost is often cited as a reason for this reluctance, but a study published Tuesday by UPenn researchers in the journal Circulation finds that cooling is more cost effective than many established medical therapies.

CNN: Cooling is catching on for cardiac arrest patients

It uses so-called passive systems for cooling, such as the gravity flow of water and natural circulation based on thermodynamics.

WSJ: NRC Approves Toshiba Reactor Design

Mr. HOLMES: My concern is if you add enough extra freshwater to the north Atlantic, you could slow down or even shut down the circulation which would potentially have dramatic impacts on climate, such as a cooling in the North Atlantic region in Western Europe.

NPR: Arctic Freshwater Pouring Into Atlantic, Scientists Say