The key word here is 'believe'. All anyone does is 'believe'. No one knows. And that is my point.Explain this any other way if you can:
Every working climate scientist (that is every professional climatologist, dependent upon grants for his income, his mortgage & his status) "believes" in anthropogenic climate change.
Most RETIRED climate scientists (that is those no longer on the govt. teat), do not.
Ergo the difference in "belief" is solely down to the need to protect one's income & status.
There isn't enough certainty for governments to be acting the way that they are. Clearly (in my opinion) 'climate change' is a cover for something else. And I personally think the most likely explanation is what I outlined above re the impossibility of exponential growth of the economy (and its very definite and imminent collapse).
The current model cannot work indefinitely as you cannot have exponential growth in a finite world. Eventually we would destroy the world - but fortunately for the world we're going to destroy our society first and set ourselves back to the stone age! LOL Nature has a way of sorting things out.