Climate change deputy minister going to climate change conference, in a glitzy oil funded country. $18k for a six day conference is within the realm of reasonableness. Round trip business class tickets for one person YVR - DXB will run you around 10K CAD. Economy is still like 2.5k.
I guess he could save 18k, attend remotely and let Chevron, Shell, bp, and the Canadian Association of Petroleum Producers do all the handshaking and talking.