within a decade

Yeah, no. Even with our help, even with having all our energy being carbon neutral, and not adding any additional carbon into the air, spending over half our energy budget, earth co2 levels would take decades, or more around a century to get back to normal.

And remember that CO2 comes from more places that are hard to stop. Concrete emits CO2, airplanes likely won't ever become electoral and will always emit CO2, same likely for large cargo trucks.

Fusion must be ignored because that has been "juuuust around the corner" for 5 decades now. Big strides were made recently, but it still will likely be decades away at best and then building a commercial reactor in the multi GW ranges will also take another decade.

Meanwhile, the vast majority of our energy still is carbon based and will continue to be so for the coming decades.