Yeah the lack of a timestamp is definitely confusing. The page source lists a definitely incorrect timestamp, I guess the time the article was digitized.

    "@type":"NewsArticle","author":[],"dateModified":"","datePublished":"2021-04-20T13:32:25Z",

Searching google for the first paragraph brings up related articles that point out it was said in 1989.

https://www.snopes.com/fact-check/nations-vanish-global-warm...