Humans have pumped enough groundwater to change the tilt of the Earth
2 trillion tons = 1/3 of 1 billionth of the mass of the earth. the distance from the ground to the surface is around 5 millionths of the radius of earth (like 100ft)So you're talking about a change in angular momentum that is on the order of 10^(-20) times the angular momentum of earth (mr^2 \omega).A change in the pole of earths rotation by 31 inches (10^(-7) times the radius of earch) corresponds to a change in angular momentum on the order of 10^(-14). So we seem to be off by 7 orders of magnitude.I call bullshit.