30 years is an underestimate. Homo sapiens have been around 350,000 years. We've only had indoor plumbing for the last 200 or so.

It took 349,800 years for us to install a toilet. Constructing a pyramid took 346,000 years. Granted, the survivors of climate disaster will have the benefit of legacy technology, but surviving in these new conditions well enough to create a society capable of widescale adaptation of our current society's abilities will take several thousand years at best. As they say, Rome wasn't built in a day.