Why must doctors preach on global warming?

Andrew Bolt, Herald Sun (Australia)
Why must a doctors’ union form an official view on whether the global warming scare is really, really real?
What on earth it its expertise in climate science, and why must its members have a collective view?
And can Brian Owler rule out standing for Labor preselection?   .....
There has been no real warming of the atmosphere 17 years now. Shouldn’t Owler be asking instead why the predictions he touts should be believed when the models have been so wrong for so long?
And shouldn’t he actually assure patients here that a warmer world is probably a healthier world?"