You shouldn't be dripping with sweat just from walking. I walked several miles yesterday, on a warm day, just for fun - not a drop of sweat left my brow. If you're overheating, wear less clothing. This notion "I need to be ferried around from air-conditioned box to air-conditioned box in yet another air-conditioned box so that I can obey my office's dress code in the height of summer" is not an attitude we can afford to keep, in the 21st century.
Not to say we should abolish all motorized transport. In any modern city there should be half a dozen ways of getting around that are all faster than cars. Light rail, buses, casual bicycles, and electric scooters spring to mind.
I invite you to try different climates around the world. It is not at all unusual to be drenched in sweat from just walking outdoors for most of the year in many parts of the world. I do agree with the rest of your comment, however.
If climates are different in places, solutions should be different in places too. Yes it might not be feasible to force everyone to cycle in Texas, but that doesn't mean that everyone in the US should drive everywhere.
I bike 6+ miles per day, and several thousand per year. I used to run 10+ miles per week, with periods on the order of 40 miles per week. I'm in pretty good shape.
It's going to be 100 Fahrenheit (40C) next week. It's 93 and rainy today. This will continue to happen regularly from now until September or October.
When I talk, I'm going to sweat, especially where there's no shade or if I walk beyond a slow saunter. Being in shape does nothing to prevent that.
People are different. Some will sweat by doing nothing at certain temperatures. Just like there are people that are fine swimming in ice water and others... that are not.
I presume you don't do family shopping (easily 30kg), or +-gazillion of other use cases that your 'solutions' don't cover and would make people's lives measurably worse and more stressful. If I have to carry all my load for weekend adventures to car that is parked 300-500m away I end up properly sweaty even in coldest winter day, and sometimes its just not possible. And I work out hard on average 6-7 times per week.
I love walking, sometimes spend hours on long walks since I live in a very pretty place but forcing everybody to adhere to your own vision of car-less cities without offering a proper alternative (not those you mention in this thread, they are far from enough)... sucks.
How can anyone transport 30kg without a 1500+kg vehicle that destroys our environment? A small folding shopping cart, perhaps? A bicycle with baskets? Your alternative is worse than those you dismiss.
You make this claim like those are the only two options. There is a wide gulf between driving an "environment destroying" vehicle and pushing a cart 10 miles in 100F degree weather.
Not to say we should abolish all motorized transport. In any modern city there should be half a dozen ways of getting around that are all faster than cars. Light rail, buses, casual bicycles, and electric scooters spring to mind.