It's going to take decades to decarbonize, the current Paris accord 2030 goal will not be met at all. Biden has set a target date for the US for 2050 to achieve net zero. That's 37 years away.

Currently we're going in the opposite direction:

"The Production Gap 2021 report states that world governments still plan to produce 110% more fossil fuels in 2030 (including 240% more coal, 57% more oil and 71% more gas) than the 1.5 degree limit.[118]"

People are talking about solving climate change as a sprint, but really it's a marathon. In fact, we don't even have the technology to fully decarbonize all sectors. It's going to take an "all hands on deck" approach and yes, will cost trillions of $$$ to achieve.

I'm pretty doubtful that we will achieve net zero energy and zero carbon before the end of the century. The first 50% of emissions reductions will be the easiest of the low hanging fruit; each successive % reduction will be that much harder and more expensive to achieve.

Tying back to your comment, each nuke plant permanently displaces millions of tons of CO2 emissions per year.