For comparison, all CCS processes in operation as of 2019 have the global capacity to store about 40 MtCO 2 /yr. In other words, based on this CO 2 storage requirement alone, current geologic CO 2 storage efforts are sufficient to support the development of 6 to 19 MW e /yr of CO₂-geothermal power capacity. But total annual CO 2 emissions are much higher, with 33 GtCO 2 emitted globally in 2017, 5 GtCO 2 of which emitted in the U.S. And addressing climate change may require geologically storing up to 1,200 GtCO 2 globally by 2100. As a result, developing additional CO 2 -geothermal power plant capacity may be possible in the future.