Any successful program of action on climate change must support two objectives—stabilizing atmospheric greenhouse gases (GHGs) and maintaining economic growth. Research by the McKinsey Global Institute and McKinsey's Climate Change Initiative finds that reconciling these two objectives means that "carbon productivity," the amount of GDP produced per unit of carbon equivalents (CO2e) emitted, must increase dramatically.
To meet commonly discussed abatement paths, carbon productivity must increase from approximately $740 GDP per ton of CO2e today to $7,300 GDP per ton of CO2e by 2050—a tenfold increase. This is comparable in magnitude to the labor productivity increases of the Industrial Revolution. However, the "carbon revolution" must be achieved in one-third of the time that economic transformation took in the Industrial Revolution if we are to maintain current growth levels while keeping CO2e levels below 500 parts per million by volume (ppmv), a level that many experts believe is the maximum that can be allowed without significant risks to the climate.
The macroeconomic costs of this carbon revolution are likely to be manageable, being in the order of 0.6–1.4 percent of global GDP by 2030. To put this figure in perspective, if one were to view this spending as a form of insurance against potential damage due to climate change, it might be relevant to compare it to global spending on insurance, which was 3.3 percent of GDP in 2005.
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