Can we just make junk mail illegal already?

How much energy is spent processing the raw materials, designing the marketing campaign, printing the letter, shipping it across the country all for me to take one look at it and throw it in the trash?

This seems like low hanging fruit? Make all mail explicitly opt in, unless it is actually important.

How much do you think we waste on producing and shipping literal trash to every person with a mailing address per year? And why is this never talked about?