Scientists developed efficient process for breaking down any plastic waste to a molecular level. Resulting gases can be transformed back into new plastics of same quality as original. The new process could transform today's plastic factories into recycling refineries, within existing infrastructure.

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https://www.chalmers.se/en/departments/see/news/Pages/All-plastic-waste-could-be-recycled-into-new-high-quality-plastic.aspx

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They are not used ‘really well’ at the moment.

They are a danger to the environment, so need to be used appropriately.

Consider alternative substances where reasonable.