Are climate tipping points already locked in?

1) What kind of claim is this?

This is a point-of-no-return claim about climate change.

2) What context is assumed or missing?

Specific tipping points and time frames are not described.

3) What has to be true for this to work?

Thresholds would need to have been crossed irreversibly.

4) When would this not hold?

The claim weakens if impacts remain sensitive to future emissions.

5) What follows if we accept it?

Efforts to reduce emissions may be seen as futile.