I didn't watch all of Al's movie (I like sci-fi but not fantasy), but I think he did briefly mention that C02 lags temp. IIRC, He threw it in real quick saying that it's complicated and moved on as if he hadn't just said it.
In Al Gore's famous ice core data, showing the supposed correlation between temperature and CO2, what he neglected to say was that there was an 800 year time lag between a rise in global temperatures and the following rise in CO2. Yes, temperature goes up 800 years before CO2 levels rise.