"Will we still be debating this if Brisbane starts to get...

"Will we still be debating this if Brisbane starts to get flooded every 2 years or so?" Yes.

"Will people still deny that humans are affecting the climate?" Yes. Scientific evidence has no effect on these people. Rational thought is out the window. Once their brain is hard-wired to believe something, then its all over red rover. Its an ideological thing and ideology is mutually exclusive with rational thought. Till death do they part with their erroneous beliefs.