[cyberax]

> Take a look at the EPA "exception" that California has needed in order to impose more stringent fuel efficiency standards for automobiles.

Yet, WA now has a carbon tax for companies operating within its borders. And it was found constitutional by the SCOTUS.

> Many forms of commerce or communication that are relevant across state lines (net neutrality rules, etc.) are considered a federal prerogative and states have limited ability to control these.

The interstate agreements are allowed as long as they don't infringe on the sovereign Federal power.

And there are plenty of workarounds. For example, CA has these ridiculous agricultural inspection stations on freeways. They are legal because they don't technically deny you the freedom of movement, declining to submit to an inspection simply revokes your driving privilege in CA.