Read and learn about history.......pick out a good one!
https://en.wikipedia.org/wiki/October_15
2008 – The Dow Jones Industrial Average closes down 733.08 points, or 7.87%, the second worst percentage drop in the Dow's history.
2016 – One hundred ninety-seven nations amend the Montreal Protocol to include a phase-out of hydrofluorocarbons.
https://en.wikipedia.org/wiki/Montreal_Protocol
The Montreal Protocol on Substances that Deplete the Ozone Layer (a protocol to the Vienna Convention for the Protection of the Ozone Layer) is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. It was agreed on 26 August 1987, and entered into force on 16 September 1989, following a first meeting in Helsinki, May 1989. Since then, it has undergone nine revisions,
https://www.heritage.org/environment/commentary/ozone-the-hole-truth
Overall, the Montreal Protocol isn't making these bad consequences go away -- they were never occurring in the first place.
The parallels with global warming are striking. Again we face a real but greatly overhyped environmental problem. In both cases, virtually everything the public has been told that sounds terrifying isn't true -- and what is true isn't particularly terrifying. But doomsayers such as Gore simply soldier on. His claims of blind animals from ozone depletion have been replaced by equally dubious assertions in his book "An Inconvenient Truth," including predictions of a massive sea level rise that would wipe away south Florida and other coastal areas.