I agree given only two choices the average consumer will spend the least, but doesn’t that suggest trying to make aware or change human behavior is the wrong approach to solving the problem?
I wouldn’t bother with land fills for a while. First on my list is standardizing electrical power at docks for container ships. They run the most polluting fuel on idle 24 hours per day while docked. The amount of carbon release is something like in the millions of automobiles per day. If they could plug into every port they can shut their engines off. They might not even need to carry the dirtiest fuel anymore.