12 years is about how long we have to curb emissions drastically in order to remain below 1.5°C warming. Beyond that, we have to employ active measures to reduce CO2 in the atmosphere or the amount of sunlight getting trapped, like active capture and geoengineering. This shit gets expensive. So it's not 12 years until the world ends, it's 12 years before it gets really, really expensive to maintain it. We can shoot for 2°C or more of warming instead, and then we pay for the costs of the world changing due to that instead, which are even higher -- adverse health effects, seawall construction or evacuation inland, refugee crises in South Asia to make the caravan look like a lone hiker in the Alaskan bush, more droughts, more and stronger hurricanes and other extreme weather events, failed crops, destabilized governments, etc. But if you can live with that, and live with socializing the costs to deal with it... yeah, we can just do that.