It’s not just CO2, though. For example, SF6 is regulated under the Kyoto agreement and a much more potent greenhouse gas. SF6 is used extensively in high voltage electrical switchgear, simply to keep the size down by having busbars closer together. There’s so much of it out there that the small fraction that leaks is very significant. SF6 takes ~20 years to get from the ground and up into the upper atmosphere. Its use has been and continues to grow exponentially across the globe.