I thought that the Raccoons did it fairly well in general. Apart from being a very enjoyable series, when it did tackle environmental issues (which wasn't really as often as one would think-- only a handful of episodes actually deal with eco-problems), it did it in a way that was less heavy-handed than some of its contemporaries. This was partially because Cyril Sneer was a multi-dimensional character. Apart from being a greedy industrialist, he was also trying to be a good widowed father and on a few occasions he even helped the Raccoons, if he realized that his plans were causing harm. His damage was mostly caused by oversight in trying to get the best deal, or his henchmen's ineptitude. He was never evil for the sake of evil, unlike the villains on a show like the Smoggies or Captain Planet.
The show also rarely addressed environmental issues by simply saying stuff like 'cutting down trees is bad because trees are good'. Rather, it showed what would happen to the animals who lived in the forest if their homes were destroyed, and how the eco-system would be altered.
I'm not saying the Raccoons tackled these issues better than any other show, but I think with a few exceptions such as the early specials, it was fairly mature and honest about it. Again, compare with something like Captain Planet. The villains on that show just wanted to pollute because they liked polluting.