Could end many ways. Nuclear war. A super volcano. A severe ice age. Depletion of essentail resources. Mass pollution. Celestial collisions. Maybe even hostile alien invasion. A change in the Earth's magnetic field and the subsequent exposure to solar radiation. The Sun going supernova - although our Milky Way galaxy and the Andromeda Galaxy are predicted to collide before that. Also, the Moon is slowly moving further away and will eventually fly out into space with pretty catastophic consequences - like slowing the Earths spin thus causing it to lose stability and wobble, which would play havoc with the seasons and thus all animal and plant life.
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