It takes a certain kind of self-delusion to blame climate change and at the same time ignore that your own actions has been one of the major drivers, both in the past and today, of that very same climate change.
While you cannot put the blame on climate change onto iran alone (all of humanity has a part in it), the regime wants to deflect the blame conveniently onto climate change so as to absolve themselves of being responsible for their current water crisis.
So it's not really delusion, but irresponsibility and selfishness.
Iām only putting 2-3% of the global climate change as directly attributable to Iran. And their explicit attempts at preventing progress in stopping it.