Humans pumped so much groundwater out of the earth that the planet has begunto wobble detectably on its axis, a new study has found. On its own terms, the magnitude of the new wobble is slight — a matter of millimeters, which puts it in the same approximate speed category as Earth’s slowly drifting continents.…
The Earth had its shortest ever day this summer, thanks to a wobble in its axis which meant it completed a single spin in a fraction of a second less than 24 hours.