Well-meaning, but really poorly handled
First off, this show is guilty of that same issue I have with lots of environmental animated works from this time period: they put all their focus on the message and visuals and not enough on the characters. Look, if I don't care about the characters or find them interesting, it's hard for me to care about what they're doing, even if it's a real-world issue. But to be honest, that's the least of its problems. I actually applaud this show for trying to focus on other issues. It tackles AIDS, overpopulation and even takes a stab at Hitler in one episode, so it's not just centered around saving the environment. Unfortunately, again, it handles this pretty poorly. For starters, Planet himself is kind of a lame hero. He usually shows up for about 2 minutes to give speeches regarding the lesson being learned, gets easily weakened by the thing he's supposed to fight against and then proceeds to let the unauthorized teens deal with everything else. And actually, that leads me to my second biggest issue with the series: pollution is what makes the main characters' powers weaker. Maybe if Planet was a machine with air ducts attached to him or something like that, I could make sense of that, but no, these kids and Planet are supposed to fight pollution. Isn't it just a little too inconvenient that their biggest weakness is the very thing they're fighting against? Maybe if they were using it for character development or this job wasn't forced on them and they were just volunteering to fight this thread, that would be a good idea, but no, in the context of the show, it makes no sense. Also, I gotta comment on the overpopulation episodes because these are, by far, the most insulting to come from this series. Both of them insinuate that parents should only have 2 children. First of all, imagine a kid being the third in the family and hearing this. Don't you think that would scar the child? It would give off the implication that any financial problems or arguments their parents are dealing with is their fault. Secondly, Ted Turner, the show's creator, has 5 kids, and yes, he had that many kids when he made this series. Kinda hypocritical, don't you think? All-in-all, I used to love this show, but it has not aged well.