I hope this article was written specifically for high-minded scientists or else it's kind of stupid to Little Boy as the base unit when that is SO vague for laymen. How big was the explosion? I dunno, pretty big? And the resulting number of 4.25b is also unfathomably large so....what does this tell us?
The total warming is equivalent to a big number of a big thing. Not a very helpful way to educate the masses on the reality of climate change, it just seems sensationalist.