This is a great question, and the science gives a nuanced answer: it's not "too late" in the sense of being hopeless, but the nature of what's achievable has changed as more warming has occurred.
Why "reversing" is the wrong frame, but doom isn't either:
•Some changes are already locked in. CO2 persists in the atmosphere for centuries, and systems like ice sheets, sea levels, and ocean heat content respond slowly. Even if emissions stopped today, warming and sea-level rise would continue for some time due to inertia in the climate system.
•"Reversing" to pre-industrial conditions quickly isn't realistic with current technology. Getting atmospheric CO2 back down significantly would require massive carbon removal at a scale we haven't achieved yet.
•However, the trajectory is not fixed. Climate change isn't a switch that flips from "fine" to "catastrophic" — it's a continuum. Every fraction of a degree of warming avoided reduces risks (extreme weather, ecosystem collapse, sea-level rise, etc.). The difference between 1.5°C, 2°C, and 3°C of warming is enormous in terms of human and ecological impact.
•Many effects are reversible on longer timescales if net emissions reach zero and then go negative (via reforestation, direct air capture, etc.), but this would take decades to centuries, not years.
The practical framing scientists and the IPCC use:
•The goal isn't "reversal" but limiting additional warming by cutting emissions to net-zero as fast as possible, then stabilizing and potentially drawing down atmospheric CO2 over time.
•There's no single "tipping point" after which all is lost — rather, risks and damages increase continuously with more warming, and some individual tipping points (like certain ice sheet collapses) could become irreversible on human timescales if triggered.
Bottom line: It's too late to prevent some climate change — that's already happening. But it's not too late to prevent the worst outcomes. The choices made now about emissions, energy systems, and carbon removal will determine whether warming stabilizes around 1.5-2°C (manageable, though still damaging) or continues toward 3°C+ (far more dangerous). Framing it as "reverse vs. too late" can be misleading — the more accurate question is "how much worse are we willing to let it get, and how fast can we act to limit that?"
If you'd like, I can look into current data on where emissions trends and climate action stand in 2026 specifically.