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Someone figured it out how to make, farm and mass produce the Higgs boson, creating microscopic particles that can generate infinite electricity with simple mechanical systems thanks to their high gravity and then humanity starts develop insane tech powered by gravity waves, traveling faster than speed of light becomes possible by switching gravity on and off. Then obviously some company or government make too much of it and collapses into a microscopic blackhole that instantly falls into the center of the earth quickly eating the planet inside out.
That's how the Earth got destroyed in "The Forge of God." :)
Plot (spoils about 50% of the book)
A hostile alien probe discovers Earth, builds/grows three wildly different alien races, has them crash one each in the world's three largest superpowers (one claiming to bring knowledge, one warning of an impending attack, one claiming to seek conquest), while robot ships plant explosives along the Mariana trench, but the primary attack is two singularities, circling earth in a decaying orbit, by the time anyone even begins to theorize about the cause of the anomalous gravity measurements across the world, both are already circling deep under Earth's crust.