Okay, I'll give you that one about the assumption of an ozone hole prior to human chlorine emissions. No real evidence, and not many people are looking for any. Barry Lomax is doing some work on plant fossils, looking for information much as ice cores are being used to figure out CO2 history, but the results over time have yet to be determined, and his people seem to be focusing on extinction events more than cycles.
Still, considering that the entire phenomenon was discovered only in the 1970s, it's a bit soon to discard all notions of natural cycles.
Scientists predict improvement in 50 years, which is pretty darn safe for most of them.
And if there isn't any, they're already laying the groundwork for "requirement creep" on the causes and effects. Human causes, of course.
Space/Science » in reply to Got any evidence? Any at all?
Okay, I'll give you that one.