Lots of disabled people can't drive, bike infrastructure also accommodates wheelchairs, mobility scooters, hand bikes and other ways disabled people get around.

50% of journeys are 5 miles or less, nobody is seriously suggesting going long distances on bikes (though I have)

You can easily carry a full load of shopping, bits from the diy shop and more, there are even tradespeople who work via a cargo bike rather than van

By cycling you get fitter very quick, you learn to pace yourself but you get faster as you get fitter. E-bikes are also an option too

Can't fix the air con issue, when I cycled to work I took a change of clothes and got changed there I don't live in a very hot place though. As for cold, a good set of waterproof mittens, some waterproof overtrousers and a good coat work wonders (and can be used when your not on a bike too)

What about those who can't drive, how do they get around?