Comment

The paper by Haewon McJeon and coauthors seeks to estimate the benefits (measured as avoided climate policy costs) of different carbon-free and low-carbon technologies in the context of climate stabilization. The paper does not include a full cost-benefit analysis of these technologies nor does it evaluate what would be needed to bring these technologies about (e.g., in an optimal R&D investment portfolio). Nonetheless, in its main conclusions, the paper provides a sensible analysis and adds to the expanding literature on this extremely relevant topic by exploring a new dimension, that of the interactions among technologies and their combined impact.