If a scientist is evaluating subjects (often well) outside their sphere of study, how does that make their opinion any better than anyone elses?

"And while 84% of scientists say the Earth is getting warmer because of human activity, less than half of the public agrees with that."

So "all" the non-climate related scientists evaluated the GW claims and read the papers and make their own opinions?

OR

Do they rather simply believe what they're taught in school?

Well one reason the carriers have much, much more area to cover. Japan is about 145,840 square miles, while Florida (where I live) is alone over 1/3 of that at 54,252 Square Miles. California alone is 3537441 square miles.

So the US carriers have to have much, much more infrastructure to cover. And infrastructure costs money, which comes from, you guessed it, the customer.