If all people, animals, trains and trucks all over the world began to walk or run towards the east (opposite the direction of Earth's spin), then

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When all people, animals, trains, and trucks move eastward, they exert a westward force on the Earth due to Newton's third law (for every action, there is an equal and opposite reaction). This action would cause a slight increase in the Earth's rotational speed in the westward direction, effectively making the Earth spin a bit slower in its eastward rotation.

If All People, Animals, Trains and Trucks All Over the World