Personally I don’t think Corona Virus even comes close considering the time and effort poured in to the Global Warming scare.
Attempts to push the “global warming” scam failed; too many people don’t believe it at all, and too many believers didn’t want to sacrifice their personal comfort for the cause anyway.
While it was a huge effort, it didn’t lead to closing schools and workplaces (in the name of carbon emissions) the way this situation is doing (in the name of public safety). Within a very short time, this has produced a much more noticeable impact on the average American.