I think the reason "the alarmism is increasing" (though I haven't noticed that) is because people are more informed, so more people are aware of the issue. It's not because those that were aware of the issues have become more "alarmed".
As far as the actual issue goes, it's there and it's real. There's no denying that. I can't say I know the extent of this issue, but to me it's enough to know that it's real to feel a certain responsibility to avoid that it gets out of hand. There have already been complications that are pretty undeniably related to manmade activities. There has been more cases of extreme weather (and that's something that I can notice from where I live), sea levels have risen, deserts are spreading more and more rapidly, mean temperature is increasing. All these things are measurable and have been measured.
It's better to be safe than sorry here. Better to take too many preventative measures than too few. Better to take action now than to wait to find out how big the consequences will be.
