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Greenhouse gas removal (GGR) plays an increasingly important role in meeting the climate goals of keeping the global temperature rise below 2 °C above that of the preindustrial era. There are many GGR methods which can achieve negative emissions, each with their own advantages and drawbacks. This overview chapter provides insight into the challenges of removing CO2 from the air while highlighting opportunities for the GGR technologies discussed throughout the rest of the book, and considerations facing their future development and deployment.

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