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I have my opinion, but it is not required as the world has it's own definition.
We have 12 years to limit climate change catastrophe, warns UN | Environment | The Guardian
https://unfccc.int/process-and-meetings/the-paris-agreement/what-is-the-paris-agreement
So for the sake of discussion, a boundary of 2°C could be used for distinction between catastrophic and non catastrophic AGW.
If the warming is below 2°C, we can still have AGW, but will miss most of the catastrophic predictions.
Keeping warming below 1.5°C would be even better.
Let's reduce co2 to.make it happen