Regardless of his counter-example, I think the chosen time period is too short to mean anything significant. I'm not saying global warming isn't a concern, but

Regardless of his counter-example, I think the chosen time period is too short to mean anything significant. I'm not saying global warming isn't a concern, but that graphs like these are not useful in reference to global warming. I mean imagine if in a decade global temperatures drop for a decade, are we going to assume global warming isn't an issue anymore?