I'm pretty sure the .gov (via the EPA) has decreed that greenhouse gasses, including CO2, are harmful so they can issue legislation by decree (increased regulations) and circumvent the legislative process. It's gonna make it a lot easier for the anthropogenic global warming alarmists to further their agenda and impose their will on the populace now.

It's something the ATF has been doing for a long time. They don't really have to pass new laws to ban or reclassify certain firearms.