I don't believe that's true, it is a valid point: a lot of us talk a good game about caring for the environment, but when push comes to shove we are unwilling to give up luxuries we've grown accustomed to.
^) Although not for me, many people I know in the climate movement, and some figureheads like Greta Thunberg. There have also been comments from scientists who find having to fly to conferences problematic. But that's all anecdotal.