Conversation so far:
What was Gore like while in Harvard?
On his second day on campus, he began campaigning for the freshman student government council and was elected its president.
How did Al Gore do there?
During his first two years, his grades placed him in the lower one-fifth of his class.
Did Al Gore start applying himself more after that?
In his junior and senior years, he became more involved with his studies, earning As and Bs
Did Al Gore get into any trouble while there?
During his sophomore year, he reportedly spent much of his time watching television, shooting pool, and occasionally smoking marijuana.
Did Al Gore graduate?
Gore graduated from Harvard in 1969
What else did Al Gore do while there?
In his senior year, he took a class with oceanographer and global warming theorist Roger Revelle

Question: What else did he do with global warming at that time?
Self-contained rewrite: What else did Al Gore do with global warming at that time?