What does it mean to be an expert these days?

Rahim Kanani says: 

As a society, we put an enormous amount of trust into the advice and insight of so-called experts, and yet it seems to me that the word itself has been utterly stripped of its authenticity. What does it really mean to be an expert anymore? Indeed, you can still find so-called scientific experts trying to refute climate change. Perhaps this is what led to the explosion of crowdsourcing information and ideas, for if the experts keep getting it wrong, the rest of us together can probably get it right.