Rising sea levels are making each day slightly longer, and there’s no sign it’s going to stop, a new study funded in part by NASA and the Canadian government has found. …In short, as rising global temperatures melt the polar ice caps, more of the Earth’s water supply is converted to liquid, allowing it to swell the oblate bulge along the equator, when it might previously have stayed locked away in the ice. The swelling, in turn, changes the dynamics of how Earth spins in the first place, and invariably, the rotation decelerates. …the actual time it takes for a point on the Earth’s surface to make a full rotation is getting slightly longer, at a rate scientists say could get more severe as the perils of climate change deepen.