Earth's rotation has been speeding up slightly ... but nobody's prepared to do what's necessary when you have to have a negative second." The biggest concern when it comes to melting ice is ...

But we're nearing a year when a negative leap second could be needed to shave time — an unprecedented step that will depend in part on how climate change affects the Earth's rotation ...

Earth is speeding up. In the coming years, a second will need to be removed from ... it looks like a negative one is quite likely.” However long it’s delayed, the use of a “drop second ...