>hold companies accountable for the damage their products do to the environment

What does this mean? The environment is damaged because so much plastic is consumed. It then follows that to reduce damage to the environment, less plastic must be consumed.

So we have come to the conclusion that we need less plastic to be consumed, the question is how. Obviously no one wants to consume plastic, since plastic is nice and convenient and most importantly, cheap.

Therefore, if you make plastic more expensive, people will consume less of it (since they have limited amounts of money). Also known as a tax.