Who was stolen by Pluto and their mothers grief caused the earth to become unfruitful until her return?

The figure stolen by Pluto (Hades) was Persephone, the daughter of Demeter, the goddess of agriculture and harvest. Demeter's profound grief over Persephone's abduction led to the earth becoming barren, resulting in winter and famine. This myth explains the seasonal cycle: when Persephone is with Hades in the Underworld, Demeter mourns, and when she returns, the earth flourishes once more.