Building upon the author's previous research, An Inconvenient Theory expands upon the idea that multiple advanced civilizations existed during the last 130,000 years. Drawing inspiration from Charles Hapgood's controversial crustal displacement theory, the author explores how shifts in Earth's crust-not just plate tectonics or Milankovitch cycles-might explain glacial cycles, mass extinctions, and unexplained archaeological site alignments. Through detailed analysis of ancient site orientations, climate data, and geological processes, the book proposes a revised mechanism for pole shifts involving an interplay between mantle convection and tidal forces, the same forces that move Earth's oceans. The work challenges mainstream geoscience and climate models, offering a bold, alternative view of Earth's deep history and the cycles of civilization, catastrophe, and climate change.