1987 CE–1989 CE
Montreal Protocol and controls on ozone-depleting substances
Climate & environment · Ozono estratosférico · Política ambiental · Derecho ambiental · Cooperación internacional
The Montreal Protocol was adopted in 1987 and entered into force in 1989. It established legally binding controls on the production and consumption of ozone-depleting substances, later adjusted and amended; it is a cooperation policy with obligations and schedules, not proof that every exposure or environmental recovery is identical in every region.
Precision, calendar, and review
- Start
- year · no uncertainty qualifier in this record
- End
- year · no uncertainty qualifier in this record
- Calendar and convention
- Historical-era years; the source calendar is not identified. No conversion of days is assumed.
- Year zero
- The scale goes from 1 BCE to 1 CE without year zero. Changing era names changes labels only.
- Documentary review
- Date not recorded
Reading the date: duration of a process.
Sources
- ozone.unep.org (opens in a new tab)
Source provenance and scope
- Publication date
- Not identified in metadata; document review pending
- Bibliographic date checked
- 2026-09-23
The correspondence between this reference and individual claims has not yet been itemized.
This record is an editorial synthesis. Consult the sources to check claims and their limits. Chronological relationships alone do not establish causation.