Of course something real like a scientific report
NATIONAL ACADEMY OF SCIENCES a 1975 report
UNDERSTANDING CLIMATIC CHANGE A Program for Action It doesn't have an article on Wikipedia.
It doesn't even show up as a source on any article.
full text here Internet Archive (no images)
Scanned version of 1975 report here Senate Document no. 94-155
used as a source here
1. Climatic changes — Research. I. Title. QC981.8.C5U54 1975 551.6 75-827 ISBN 0-309-02323-8 Available from Printing and Publishing Office, National Academy of Sciences 2101 Constitution Avenue, Washington, D.C. 20418