Is the French government a known climate denier?
Not the current one. In France, the only climate change denier with any standing I can think of is a former Education minister (1997-2000), now completely marginalized.
I think the "dissent" aspect is actually some denier activists, and especially people proposing alternate solutions to whatever will come out of the governments' negociations. And perhaps, piggybacking on that, protests against nuclear energy, anti-capitalist activism, the usual. In fact, looking at a list of events (in French), I see that the canceled "protests" are in fact the Global Climate March events before and after the conference, and maybe a big free concert that was planned at the Arc de Triomphe. In other words, large crowds. The debates and other "alternative" events are still on.
I'm concerned about the government abusing the state of emergency, but this doesn't seem to be so much about suppressing dissent as suppressing any possible violence or civil disobedience. A better gripe would be the fact that they're blocking major roads and telling people to stay home on Nov.29-30, even not go to work if possible on the 30. Why on Earth are they not letting officials land in Le Bourget airport next to the conference center, and stay there and not bother anyone else?