1987 · Global · Science
Countries adopted the Montreal Protocol to phase down chemicals that destroy stratospheric ozone. Scientific monitoring, industry substitution and international cooperation produced a widely documented example of environmental recovery in progress.
Atlas dossier · Cold War & DecolonizationFree device narration · synchronized English captions · transcript available
Why it matters
Countries adopted the Montreal Protocol to phase down chemicals that destroy stratospheric ozone. Scientific monitoring, industry substitution and international cooperation produced a widely documented example of environmental recovery in progress.
Atmospheric scientists · negotiators · refrigeration workers · manufacturers · monitoring agencies
The treaty shows that global science, regulation and industry can respond to a shared atmospheric threat—while offering lessons for climate governance.
Interpretation note
This dossier distinguishes the event’s basic chronology from later arguments about meaning, responsibility and legacy. When comparing religious, national, Indigenous or scholarly interpretations, consult the primary and institutional sources above alongside peer-reviewed historical work.
Elsewhere in the world
1986 · EuropeChernobyl and nuclear safetyReactor 4 at the Chernobyl nuclear power station exploded during a failed safety test, releasing radioactive material across the Soviet Union and Europe. Emergency workers, residents and later scientists confronted severe immediate and long-term consequences.
1986 · AmericasTeachers protest classroom calculator policyAt a 1986 mathematics-education meeting in Washington, a small group of teachers picketed a policy supporting calculator use across school grades, arguing that basic number skills should come first.
1983 · AmericasPCR and molecular diagnosticsPolymerase chain reaction made it possible to amplify chosen DNA sequences rapidly, turning tiny biological samples into usable material for research and testing.