This Changes Everything is a 2015 documentary film directed by Avi Lewis. It is based on the book This Changes Everything: Capitalism vs. the Climate by his wife, Naomi Klein.

This Changes Everything: Capitalism vs. the Climate is Naomi Klein's fourth book; it was published in 2014 by Simon & Schuster. Klein argues that the climate crisis cannot be addressed in the current era of neoliberal market fundamentalism, which encourages profligate consumption and has resulted in mega-mergers and trade agreements hostile to the health of the environment.