I love how when anti-global warming types point at a big snow storm or what-have-you and say 'look, global warming can't be real!' and the pro-global warming crowd points out, rightly, 'weather isn't climate'
Why are you listening to the general public? The SCIENTISTS and the SCIENCE make no such claims. They have repeatedly stated that it is very difficult to attribute any single weather event to climate change. Greenpeace or the Heartland Institute or CNN or Fox News are TERRIBLE sources for scientific information. If you want the science, go to the source. Or get a summarized version of the IPCC if slogging through pages of dense science isn't your thing.
Weather isn't climate.
That being said, any fantasy about humanity being at risk for significant biological hardship is ludicrous considering that we can eat almost anything, live almost anywhere, are more resistant and adaptive to toxins and pathogens than most other large animals, and we have this thing called "technology" that allows us to move anything anywhere, radically adjust our environments, etc. etc.
Your the one living in a fantasy. Despite all our advanced technology, the world's population depends on a stable climate. Regional climate changes in the past have caused civilizations to die off. From a paleoclimate standpoint, every time a major rapid climate shift occurs there is a major extinction event. In fact, one almost wiped out modern humans not all that long ago.
All it takes is a little shift in climate patterns to cause massive problems for us. For example, if the midwest were subjected to a severe ongoing drought for a couple of years, things would get pretty ugly. What do think will happen to social stability when the price of basic food items go up 100-200%? We had a small preview of that when major agricultural production regions in Russia experienced a severe drought to the point where Russia stopped exports. This is why organizations like the DoD have been doing climate based analysis to determine the impacts of climate change on global stability. They take it very seriously.
That being said, it's unlikely climate change will end up wiping us out. There's just going to be a lot suffering for those who don't have the financial resources to deal with it.
We really need to get over the conceit that we developed in the one true immutable biosphere. 99% of previously extant species are extinct, and that's going to keep happening regardless of what we do because the environment has never been static. Without mass extinctions like what occurred during the Oxygen Catastrophe, animal life wouldn't even exist.
No climate scientist believes that the climate has always been this way. That isn't the issue. The issue i that our civilization has come to thrive in a certain climate. Now we are changing that climate. To think that this won't have significant impacts on us is very naive.