I think it's fair to say it would become common, if you imposed punitive taxes on everything except plastic. Once it's out of the ground, it's a matter of time

I think it's fair to say it would become common, if you imposed punitive taxes on everything except plastic. Once it's out of the ground, it's a matter of time before it ends up in the atmosphere, unless unusually careful sequestration measures are taken. Better to subsidize those, and tax generation, rather than try to micromanage the bit in between.