He debated the astronomer Carl Sagan on ABC's "Nightline", regarding the possible environmental effects of the Kuwaiti oil fires. Sagan argued that if enough fire-fighting teams were not assembled in short order, and if many fires were left to burn over a period of months to possibly a year, the smoke might loft into the upper atmosphere and lead to massive agricultural failures over South Asia. Singer argued that it would rise to then be rained out after a few days. In fact, both Sagan and Singer were incorrect; smoke plumes from the fires rose to 10,000–12,000 feet and lingered for nearly a month, but despite absorbing 75–80% of the sun's radiation in the Persian Gulf area the plumes had little global effect.