If you follow the links that are inlined in the article you eventually find referenced articles that they themselves have then referenced. Not optimal. These a

If you follow the links that are inlined in the article you eventually find referenced articles that they themselves have then referenced. Not optimal. These are the linked articles that contain the references for this data (haven't checked it out so I am assuming on a cursory glance) https://forbes.com/sites/jamesconca/2012/06/10/energys-deathprint-a-price-always-paid/#7b6f0c06151a https://forbes.com/sites/jamesconca/2012/06/10/energys-death... and https://ourworldindata.org/what-is-the-safest-form-of-energy https://ourworldindata.org/what-is-the-safest-form-of-energy