Okay, I bit. Went to the site with your reference. 

A couple observations: when the first sentence of the article contains a typo ("Researchers can say with 97 percent certainly that 50 percent of the heat is due to radioactive decay and other sources...) it doesn't exactly come across as a peer-reviewed scientific journal. 

And when the website itself says: "Know science and want to write? Register now and get your own column!", that credibility is further eroded.