If history is to be believed (and I'm just reading about a mini Ice Age in the 1600's) then this is, to a certain extent, a natural, recurring cycle and there is little we can do to stop it.
Like GrannyGravy, I do all I can to help save water, use cloth bags for shopping, recycle and more but I often feel that when a giant like the USA won't even join the rest of the world in trying to cut industrial emissions, and other damaging practices, what use am I?
But it won't stop me trying.
I certainly don't worry about it because our world has been through climate change before and long after we are gone will probably be turning.
And if it doesn't, then my efforts to save it weren't wasted because I did my bit.