People have been arguing nuclear is too expensive and soon renewables will be so cheap they will push fossil fuels out of the grid for 30 years, if not more. Meanwhile during those 30 years, while waiting for the price of renewables to drop sufficiently, the world has built massive amounts of fossil power generation and emissions have been going up and up.

That being said, it seems finally solar+wind+storage+a little bit of other stuff is becoming cheap enough that it's starting to make a dent in the emissions. Which is fantastic, don't get me wrong. But it's also sad we've lost decades.