There's this 500-year plan in place to resolve the weather situation. It's finally coming to fruition.
In essence, it involved developing new methodologies (the "Scientific Method"), which were able to lead to new technologies (loosely grouped under the label "industrialisation") which have produced large amounts of greenhouse gases in the atmosphere.
This has been a particularly tricky plan, but it is basically in place and is now steadily warming up the planet, according to most reports. It should only take another couple of hundred years and England will be a good 5-10 degrees warmer.
SF is a pain in the ass to get around compared to NYC without a car or bike. I love both cities (and especially the weather in the former) but the MTA and London Underground have a much wider network of subway systems and buses.
BTW, I don't mean this as a snarky retort. I'm seriously curious whether that plan has panned out for you.