"Doctor Todt" is the first historical fiction novel in a series of 8, with the collective title After the Flood. "The Flood" is not a Noah's ark thing but the increasingly obvious fact that the human race is less and less capable to manage its habitat: Earth. As for a reversal, experts determined that the point of no return was passed in 1981 then, typically, classified. Few were prepared to listen anyway. The greatest enemy of man is man himself.
I wrote about that in "The Spine of Western Culture" then, started on this epic account of capable and well-informed people who work on ultra-deep level, preparing to survive and be ready to resurface and rebuild the post-deluvian remains, in a way that makes a repetition of what caused the catastrophe impossible to repeat.
The storyline stretches from the last fugitives leaving flaming Berlin in 1945 to survival stations orbiting somewhere in the northern hemisphere around 2050.