POK- why decline an exploration card?

First time playing POK and the first 2 players declined their exploration cards in round 1.

I'm 7th in round 1 and trying to figure out what incentive they have to decline?

I'd ask at the table but everyone is busy arranging trades and side deals so I will probably get a clear answer here first.

Almost all the exploration cards I've seen give bonuses that players can choose to use or not.

I don't know all the new race abilities in POK but my quick readthru I don't remember anything about exploration other than the race that starts with Dark Energy Tap and can use it on any unexplored tile.

Is there some way to draw a 2nd exploration card, like waiting to get Dark Energy Tap if the player does not like what they drew?