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Acknowledgments
Funding: H.D.M. acknowledges funding from the Natural Sciences and Engineering Research Council of Canada. The contributions by S.W. were supported by a fellowship from the Social Sciences and Humanities Research Council of Canada.
Author contributions: H.D.M. led the study and wrote the sections related to the state of the climate system, geophysical constraints, and the alignment of targets with global temperature goals. S.W. led the writing of sections in the second half of the paper and provided input on other sections.
Competing interests: The authors declare no competing interests.
Data and materials availability: All data displayed in this paper is taken from previously published studies or publicly available data repositories as noted in the manuscript text.