"Humanity surviving," is a pretty low bar. We have refugee populations fleeing war and mass murder who are surviving, but that doesn't mean their situation is an enviable one that we should try to emulate by having everyone become climatological refugees.
Technological societies also have the most to lose. Easier to rebuild a village of grass huts than New York City. Easier to feed your population when you never relied on anything but locally grown products produced by manual labor than when you are dependent on gigantic irrigation projects, artificial fertilization, huge machinery to plant, harvest, and transport the agricultural products, and the infrastructure to support it.
Dude, imagine if the toilet paper factories were destroyed!
Zombie apocalypse I could handle. Lack of toilet paper, though?
I think I'd die just being reduced to Scott.
Again, I fundamentally disagree. Look at any highly traumatic event - say, the recent tsunami. Which population survives better, the one sitting fat, dumb and happy in grass huts, or the one which receives some warning through phones, television, radio? When a drought or anomalous cold spell hits, which population survives better - the one raising the same crops around the huts for hundreds of years, with little or no access to alternate crops? Or the one with extensive knowledge of which crops grow best in different conditions, engineered crop variants for specific conditions, the ability to extensively fertilize, irrigate and/or protect crops as required, and the ability to transport large quantities very quickly from the haves to the have-nots?
Look at the effect of the Medieval Warm Period on England versus its affect on, say, Scotland. England, with a much better transportation network, much more widespread trading network, much more knowledge of (and access to) a variety of crops and other products, and a higher level of technology overall, prospered greatly from the warmer weather. Scotland prospered only slightly better than in the colder, more normal weather before. The whole point of technology is to develop security, prosperity, and above all else control over one's environment.