A new video game, “Fate of the World,” challenges players to stop climate change without crashing economies or ecosystems:

Change is achieved by applying policies, in the form of cards, to a dozen geographical regions, with each turn representing the passage of five years. Players can promote nuclear power and institute cap-and-trade schemes, or pin their hopes on untested technologies like fusion power or carbon capture and storage so-called “clean coal.” ...

Far darker options are available for seriously unscrupulous planet savers. These include sending secret agents to overthrow recalcitrant governments and surreptitiously adding contraceptives to the water supplies of nations resistant to birth control. Those with apocalyptic leanings can even release a genetically engineered virus to crash the world population.

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