Climate Change Thoughts

I read other blogs....all over the internet.
Many are about preparedness. Some are more of a survivalist bent. And cooking/food blogs. And news blogs. History web sites.Paranormal web sites. Nature web sites. Farming web sites. And on and on.... I read a lot, lol!
Recently have been reading some of the survivalist blogs out there...you know,*Doom and Gloom*type blogs who, in past years would discuss and pick apart the various calibers of ammunition, firearms,etc. or showed you how to make your own generator out of parts you could find at your local dump. Kinda edgy and gritty blogs.
Anyway....started reading about climate change the other day. That led to some of the gloom and doom guys....only some are not about survival anymore. They don't believe we, as a species, can survive.
Case in point: http://survivalacres.com/blog/   and  http://guymcpherson.com/ .
So....species extinction. Why have a garden then ? Why store food? Or learn to shoot? Why prep at all if we are all going to burn up or starve or whatever?
Yes,the planet may warm up. Yes, we will have innumerable challenges to face, adaptations to make.
But we can and will adapt. Plants adapt, animals adapt. And humans adapt best of all.
But here's the bottom of the truth that everyone out there should remember:
The planet adapts.
If the temperature goes up, that will cause a slowing of the  North Atlantic Gyre ( http://en.wikipedia.org/wiki/North_Atlantic_Gyre ) and, in all probability, the other 4 major ocean gyres (currents like the Gulf Stream). These currents slow and the climate cools. Perhaps a little, perhaps enough to balance or, perhaps too much and we'll find ourselves in a new Ice Age. 
The planet will change, perhaps drastically. Most of us will not be here to see it. Not even our children, depending on the speed of these things happening. 
So why prepare?
Because in the here and now things happen. You can lose your job, there could be a hurricane, a riot that spills over into your suburb, a new *Spanish flu*, any or all of these things can happen.
Being prepared is a hedge against all these. 
When the hurricane hits and you have no supplies for your family do you think telling them "Oh well, in 100 years the planet will be so hot it will kill everyone anyway" will comfort them, fill their stomachs, slake their thirst? 
As for climate change, global weirding, whatever you want to call it....yes, prepare for the storms. Prepare for chaos. Prepare for higher prices at the grocery store (drought in California),  higher prices for damn near everything (transport costs going up!), new infectious diseases, etc.....
I don't worry about 100 years from now, I worry about next week or next month.