
https://www.globalwitness.org/en/blog/problem-hydrogen/

https://www.emcdda.europa.eu/system/files/publications/13838/TDAT21001ENN.pdf

http://www.conservativehome.com/platform/2017/05/neale-richmond-no-deal-between-britain-and-the-eu-would-be-a-disaster-for-ireland.html