An international agreement to control ozone-depleting substances
In his December 1987 message seeking Senate consent to ratification, Reagan described the Montreal Protocol as an international agreement to control ozone-depleting substances.
What this does and does not establish
The message records how the U.S. president presented the agreement reached in Montreal. It is not the text of the control schedules or evidence of a recovery of the ozone layer in 1987.
- Region
- Transregional
- Theme
- Environment, health and technology
- Kind of record
- Placed in a year. A source places this in one year. It is listed under that year; no day precision is invented.
How it is dated
- Date reference
- 1987
- How we use it
- The message records how the U.S. president presented the agreement reached in Montreal. It is not the text of the control schedules or evidence of a recovery of the ozone layer in 1987.
The date reference is this project’s reading of the source’s date. It may give an era name, a reign or a calendar in a normalised form rather than in the source’s own words; the dating notes say what the source prints.
Dating notes from the research record
Year of the act or policy, as identified in the cited document or its institutional dating.
File names and line numbers in these notes, and in the limits above, refer to the project’s retained copies of the cited sources. Names such as calendar_headers are the project’s calendar look-ups, and “the investigator” is the research step that prepared the record.
Sources and quoted text
Line and character numbers under “Location” refer to the project’s retained copy of the source. For database rows, “Edition” names the batch of rows that was fetched together.
Source 1 · Supports the statement
Message to the Senate transmitting the Montreal Protocol
Ronald Reagan, President of the United States
Quoted text (English)
The Montreal Protocol provides for internationally coordinated control of ozone-depleting substancesSource credit and reuse conditions recorded for this source: U.S. federal official text, public domain in the United States (17 USC 105). Credit the named author and repository; text only, no images or seals.
Exact source version
9e26fa7ebb1b03302d2edb0cbce9df42e8ad87313df0adb1f7edc37a903ceceeChecks and changes
Source checked 2026-11-13. An independent AI evidence review supports this bounded, attributed wording. That review does not guarantee historical truth. How records are checked
No correction has been made to this record’s statement or limits.
Revision tp20_ozone
Exact revision fingerprint
a5e26605b02b2a56d24d008ca03db0f649af80893dfb39e4327745a2f7611e73