"We don't want to frighten [students]," he said. "We want to make sure whatever they're hearing about is being done in a balanced way. It's OK for them to be challenged in their thinking. What we want is for that to be carefully managed by our teachers in classrooms."
Some Liberal MPs in the Morrison government were privately disparaging of Advance Australia's plans but would not comment on-the-record. Education Minister Dan Tehan did not respond to requests for comment, while the chief executive of the Association of Heads of Independent Schools of Australia, Beth Blackwood, declined to comment.
Mr Kelly has contacted Advance Australia about its plans. He said all schools should also display "a large chart of Australian rainfall over the last 120 years" because it would prove the country is not becoming drier.
"A lot of young people write to me on this issue. They have a very one-sided position and they clearly haven't been exposed to a lot of the facts," Mr Kelly said. "At the moment it seems clear to me they're only getting one side of the argument, a hysterical side of the argument, and I think it's actually causing a lot of kids a lot of harm."