70s
i vaguely remember my fifth grade teacher telling us some folks think we're overdue for an ice age. the decade of the 70s was unusually cold. so it seemed reasonable. i really don't remember him mentioning anything about global warming. anywho, i came across an article that counted papers published then that took a position on warming or cooling. warming outnumbered cooling 44 to 27. which doesn't jibe with assertions that scientists have done an about face on the topic.