At a conceptual level, the difference is clear. Criticism marshals evidence and arguments in a rational effort to persuade. Canceling, by contrast, seeks to organize and manipulate the social or media environment in order to isolate, deplatform or intimidate ideological opponents. It is about shaping the information battlefield, not seeking truth; and its intent — or at least its predictable outcome — is to coerce conformity and reduce the scope for forms of criticism that are not sanctioned by the prevailing consensus of some local majority.
If you’re serious about climate change—really serious—then your plan cannot demand very much sacrifice from people. Maybe none, in fact.