Michael Tobis says Gore said it — that’s good enough citation for me:
Even writing an article like this one carries risks; opponents of the president will excerpt the criticism and strip it of context.
But in this case, the President has reality on his side. The scientific consensus is far stronger today than at any time in the past. Here is the truth: The Earth is round; Saddam Hussein did not attack us on 9/11; Elvis is dead; Obama was born in the United States; and the climate crisis is real. It is time to act.
– Al Gore, in Rolling Stone, June 22, 2011