Diplomats from 115 countries and 52 scientists hashed out the most comprehensive and gloomiest warning yet about the possible effects of global warming, from increased flooding, hunger, drought and diseases to the extinction of species.
More than 2,500 scientists worldwide contributed to the report, relying on peer-reviewed studies to make their findings and subjecting them several times to outside review.
The language in the report had to be approved unanimously by governments. Among scientists, changes had to be by consensus. In addition, every change of wording had to be approved by all scientists who wrote the affected section.
The "technical summary," which eventually will be released to the public, will not be edited by diplomats. The technical summary, Rosenzweig said, contains "the real facts."