Shouldn't we encourage consumption of single-use plastics? Plastic is a good way to sequester carbon
Plastic isn't a good way to sequester carbon the sense that this term is usually meant.

Carbon sequestration is normally assumed to mean


  [...] the long-term removal, capture or sequestration of carbon dioxide from the atmosphere to slow or reverse atmospheric CO2 pollution and to mitigate or reverse global warming.


(From Wikipedia, my emphasis.)

This is not how plastic production works: the great majority of plastic is made from petrochemicals.  So almost all plastic is made from fossil carbon, not from carbon extracted from the atmosphere recently.

With plausible assumptions about the energy used in making plastic and its source, then turning fossil carbon into plastic which is then not burnt is probably better in terms of carbon emissions than just putting the fossil carbon straight into the atmosphere.  But it's worse (again in terms of carbon emissions) than just not making the plastic at all.



Note that there have been plastics made from plant materials, and many early plastics were made like that: Celluloid is a good example.  I thought Bakelite was as well, but it turns out it's the first one that wasn't.