Sure it questions it. As a helpful thought experiment, try this: look at how many phrases are placed in quotation marks in this piece. Each time the writer encloses a phrase like "global warming" or "pollutant" in question marks, he's trying to cast doubt in your mind. It's a very transparent and sophistic technique.

The writer (Claude Allegre) is, in fact, a climate-change denier. He's not merely trying to foster more scientific investigation into climate change or slow the pace at which we adapt to it (although it looks like that's what he wants you to believe here). He doesn't believe that humanity is causing climate change at all (a view that flies in opposition to the long-settled science on this subject), and therefore he's trying to get you to believe that simply slowing down our response to climate change is perfectly OK. But this just isn't the case; it's a recipe for permanently hosing the environment.

At the end of the day, there's an Occam's razor test you can apply to this kind of thing. If this were real science, it'd be published in a peer-reviewed journal, not a conservative mouthpiece of big business like the Wall Street Journal.