Been playing for about 2 weeks now and LOVING this game. One question though, it says in the glossary that an Environment card cannot be dealt damage but that some environment cards have HP's. Does this mean you cannot target any environment card with HP's to reduce it to 0 and remove it from the game? This would mean that you would need a card that specifically removes an environment card in order to ever get rid of environment cards even if they have HP's. Sorry if this question is a bit confusing in its wording but I'm not sure how else to explain it.
Anything with HP is a possible target for attacks, so you can reduce it to zero.
Environment cards with HP are environment targets (which is a separate glossary entry but is also, sort of, mentioned in the glossary entry for environment cards in general. but yeah, it might take a moment to realize what it's saying depending on how you read it)
Yeah, an environment card with hp is also a target (any card with hp is a target). Since it's in the einvronment deck, it's also an environment card and therefore can also be removed by anything that destroys environment cards (eg Grappling Hook, Bio-Engineering Beam, RPG Launcher, etc).