Can you link to some? I haven’t yet seen anything I’d consider credible which says that climate change due to human activities is doubtful, myself. Sorry – to answer your question: in some circles you would not be considered wrong-headed or ignorant, because it seems like you’ve made an effort to educate yourself about the issue. However, climate change is an issue where peoples’ beliefs tend to trump stated evidence. For instance, as you can see I’m inclined to call BS on studies that come out in favor of the climate-change-is-bunk side. To self-analyze a bit, I’m guessing that my inclination is due to the tendency of the climate-change-exists camp to throw their hands up in exasperation that the other side continues to claim otherwise for what seem to be primarily selfish reasons (the ability to continue polluting, as it would appear, is a fiscal boon). This gives a generally accepted impression that the latter is sane and the former, selfish to the point of insanity. Due to this impression, I’d say that your suspicions are correct, and you cannot claim something like “Climate change is not a proven fact” without being widely seen as willfully ignorant.