Owner's Manuals (YES! They DO exist! ) usually say to start it and take right off. Googling the topic also reveals bodies of knowledge that say prolonged idling for "warming up" is a poor way to warm up and actually creates MORE wear because driving it straight off warms it up so much faster, not to mention that the idling creates excess emissions and burns fuel.
Besides, you are in CA and do not even know what "cold" is.
Yes, I agree.
Plus, driving it warms the entire drivetrain and not just the engine. Your 02 sensors will go to closed loop faster leaning out the fuel burn. Once your entire drivetrain (and fluids) are at normal running temps, you will get the best fuel economy too.
One thing I won't do is run the air at all until I'm actually out of the road for a minute or two, if its needed otherwise just vent. I usually just crack both front windows as long as I'm in stop and go at first, but as soon as it can be done I'll typically just turn my vent on low.