Mann and Wainwright explore how climate change will reshape global political order by forcing a confrontation between capitalism, sovereignty and planetary governance. Mann and Wainwright propose four potential futures: Leviathan (a liberal capitalist world order enforcing climate policy from the top down), Mao (a state driven, anti-capitalist alternative), Behemoth (reactionary populism that denies climate science), and Climate X (a decentralised, just oriented model rooted in radical democracy). While Leviathan may dominate, the authors argue that true climate justice lies in Climate X – a vision that resists both authoritarian control and capitalist preservation. The book blends political theory and Marxist critique to challenge readers to rethink who holds power in shaping our planetary future.