Permafrost by Alastair Reynolds

In a future where humanity faces extinction due to a global ecological collapse, a team of scientists embarks on a daring mission to alter the past and save the planet. The narrative unfolds through the eyes of Valentina Lidova, a schoolteacher turned time-traveling operative, who navigates the complexities of quantum mechanics and the ethical dilemmas of altering history. As the team grapples with unforeseen consequences and internal conflicts, they must confront the fragile nature of reality and the profound impact of their choices on the future of humankind.

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