Bibliography (8):

1. https://www.science.org/content/blog-post/ibuprofen-revolution

2. Victorian Pioneers of Corporate Sustainability

3. The Atom Economy—A Search for Synthetic Efficiency

4. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Green_chemistry  :

      https://en.wikipedia.org/wiki/Green_chemistry

   2. https://en.wikipedia.org/wiki/United_States_Environmental_Protection_Agency  :

      https://en.wikipedia.org/wiki/United_States_Environmental_Protection_Agency

   3. https://en.wikipedia.org/wiki/Boots_(company)  :

      https://en.wikipedia.org/wiki/Boots_(company)

   4. https://en.wikipedia.org/wiki/Celanese  :

      https://en.wikipedia.org/wiki/Celanese

   5. https://en.wikipedia.org/wiki/Ibuprofen  :

      https://en.wikipedia.org/wiki/Ibuprofen