Why is it that because someone has a high profile, be it an actor, sportsperson, pop star they think they know it all.
It will be interesting in a hundred years or so to see what is being said then about climate change.
There's been plenty of predictions by so called smart people that have been proven wrong.
Like:
The head of IBM - who in 1943 predicted there will only be a world market for 5 computers
The Y2K Bug
The days of sub $100/barrell will never be seen again