Any climatologist would argue 30 years is by far not long enough to be able to say anything useful about climate change in the long run. 30 years on a couple of billion years is nothing.

In fact, looking back at information about past time climate changes, we're really not in any danger at all. Did you know it used to be a whooping +10 degrees Celcius hotter in most places on Earth a couple of million years ago? Oh, and it had more to do with the Earth's orbit around the Sun and volcanic activity (plate tectonics-related stuff) than anything different.

I'm not convinced our current influence is a big as those two factors in the old days used to be.

Then again, obviously things will go wrong from the moment where our influence turns out to be irreversible.