According to this CNN.com article:
Admittedly, this is taken something out of context, as the speech quoted a group called the Adirondack Council earlier. But the article is about Gore’s attack of Bush’s ‘clear skies’ plan. Which is a national thing. And acid rain affects a hell of a lot more than the Adirondacks. It just seems to me that the article calls for a slightly more general definition of the cause of acid rain in America.