I recall Nancy in some of her older work mentioning something about how we'd see an increase of 'green meteors', and had wondered about exactly what made GREEN meteors so special?

I think I've discovered her original inspiration for the green meteors. In H.G. Wells' "War of the Worlds", all the Martian war machines originally come down to Earth as flaming green meteors.

Incidentally, in WarCraft III, green meteors begin falling at the height of a renewed battle between orcs and humans, signalling the return of the Burning Legions of Hell, and spawning gigantic Infernos, which look like rock golems with green flames all over their bodies. Funky stuff.

Seems like green meteors always mean bad news.