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                                    Human systems will have to adapt to climate change. Understanding of themagnitude of the adaptationchallenge at a global scale, however, is incomplete, constrained by a limited understanding of if and howadaptation is taking place. Here we develop and apply a methodology to track and characterizeadaptation action; we apply these methods to the peer-reviewed, English-language literature. Ourresults challenge a number of common assumptions about adaptation while supporting others: [...]                            