As negotiators plot out how to fuel the world while also reducing carbon emissions at climate talks in Scotland, nuclear power is a central sticking point.

As negotiators plot out how to fuel the world while also reducing carbon emissions at climate talks in Scotland, nuclear power is a central sticking point.

On Monday, a group of big city mayors traveled to the U.N. climate conference in Scotland to demand that world leaders follow the science and act now to head off a catastrophic increase in global temperatures.