http://library.fes.de/pdf-files/wiso/14397.pdf
https://www.sciencemag.org/news/2020/04/huge-step-forward-mutant-enzyme-could-vastly-improve-recycling-plastic-bottles?utm_campaign=news_daily_2020-04-08&et_rid=682362580&et_cid=3279246#
https://chemscore.chemsec.org/reports/
https://www.voanews.com/a/china-cancels-23-loans-to-africa-amid-debt-trap-debate-/6716397.html