It was too late. Planet Earth was dead.
The point of no return occurred during the early 2030s.
That was when the Arctic started remaining ice-free the entire year. Then it started accelerating.
The albedo of Earth fell, so more energy was absorbed from the Sun. In turn that led to more ice melting and faster.
Greenland started losing massive amounts of ice per month. When it lost its ice too, and Siberia…