1. We aren't burying them sufficiently to take them out of the biosphere, that'd be expensive. 2. Even if we could, plastics are generally not made from hydroc

1. We aren't burying them sufficiently to take them out of the biosphere, that'd be expensive. 2. Even if we could, plastics are generally not made from hydrocarbons pulled out of the biosphere, so it doesn't counter CO2 emissions and global warming.