At least in the Western world, we have been panicking about climate change non-stop for over 20 years. It's been a high-profile issue for as long as my political memories stretch back.
Everyone is already aware of it. It is already taken extremely seriously. And a HUGE amount is being done about it.
That was well before Iraq; it was the only thing we knew about him. And it was enough to turn him into the world's bogeyman. Climate change was super-high-profile
(Although arguably, if everyone loves you for telling it, maybe your "inconvenient" truth isn't all that inconvenient.)