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Climate change is just one of many related sustainability problems that the world faces. In addition to rising atmospheric CO2, we are approaching or have already exceeded multiple other planetary boundaries — such as fresh water, nitrogen, phosphorus and biodiversity loss — that CO2-mitigating technologies cannot solve. Solving climate change on its own would require immense investments but leave too many other problems unaddressed. That is not to say that these technological innovations are irrelevant; Pacala and Socolow’s desire to break down the challenge into manageable pieces is both valid and appreciable. What’s missing from their assessment is the fact that the world is a complex system, and systemic problems require systemic solutions.