Humans produce about 2tonnes of CO2 annually, and even at an industrial scale, CO2 scrubbing costs about $1,000/tonne: https://news.stanford.edu/news/2011/dece

Humans produce about 2tonnes of CO2 annually, and even at an industrial scale, CO2 scrubbing costs about $1,000/tonne: https://news.stanford.edu/news/2011/december/extracting-carbon-air-120911.html#:~:text=After%20a%20detailed%20comparison%2C%20the,for%20current%20power%2Dplant%20scrubbers https://news.stanford.edu/news/2011/december/extracting-carb.... And that's at an industrial scale - residential scale would be even more expensive. Not all of the CO2 in the air has to be removed though and humans are not at home all the time. It would cost, at the very highest range, $50t to stop climate change over 20 years. That's $2.5t per year, or $2,500 per middle class person for 20 years. Plus, we get a whole lot of benefits from a cleaner environment without oil and coal. https://www.globalgiving.org/learn/cost-to-end-climate-change/#:~:text=Estimates%20of%20how%20much%20money,how%20to%20stop%20climate%20change https://www.globalgiving.org/learn/cost-to-end-climate-chang.... Its cheaper and more effective to just... deal with oil and coal usage as a collective, rather than all of these ad-hoc individual amelioration measures.